meeting request - Page 47

Is it safe to unset PHP super-globals if this behavior is documented?

- by Stephen

I'm building a PHP framework, and in it I have a request object that parses the url as well as the $_GET, $_POST and $_FILE superglobals. I want to encourage safe web habits, so I'm protecting the data against SQL injection, etc. In order to ensure users of this framework are accessing the safe, clean data through the request object, I plan to use unset($_GET, $_POST, $_REQUEST); after parsing those variables. I will document this in the method comments, and explain in the framework documentation that this is happening. My question is: Would this be desirable behavior? What are the potential pitfalls that I have not foreseen?

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How to build Firefox extention to intercept HTTP requests and responses?

- by didizingo

Hi, how do I insert a listener to Firefox http requests and responses, so that I popup a window with the address requested and the response body? Note: I have to do this building an extension to Firefox. I need a button to activate or disable the feature. For every request, I need to popup a window with an "Ok" button to allow the request to be made. Likewise, I need to popup a window with the response body from the web server, with an "Ok" button to allow the content to be displayed by the browser. I know that I have to use nsIHttpChannel, as shown here, but I don't know where to put such code on the extention's architecture. I have very little knowledge about javascript. Could anyone help me?

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Recreating http request with cURL incl. files

- by Toby

I consistently get the error 'failed creating formpost data' from the below code, the same thing works perfectly on my local testing server, but on my shared host it throws the error. The sample part is just to simulate building the array with both files and non-file data. Essentially all I'm trying to do here is redirect the same http request to another server, but I'm running into so many troubles. $count=count($_FILES['photographs']['tmp_name']); $file_posts=array('samplesample' => 'ladeda'); for($i=0;$i<$count;$i++) { if(!empty($_FILES['photographs']['name'][$i])) { $fn = genRandomString(); $file_posts[$fn] = "@".$_FILES['photographs']['tmp_name'][$i]; } } $ch = curl_init(); curl_setopt($ch,CURLOPT_URL,"http://myurl/wp-content/plugins/autol/rec.php"); curl_setopt($ch,CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"); curl_setopt($ch,CURLOPT_HEADER,TRUE); curl_setopt($ch,CURLOPT_POST,TRUE); curl_setopt($ch,CURLOPT_POSTFIELDS,$file_posts); curl_exec($ch); print curl_error($ch); curl_close($ch);

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Make a PHP GET request from a PHP script and exit

- by Abs

Hello all, Is there something simpler than the following. I am trying to make a GET request to a PHP script and then exit the current script. I think this is a job for CURL but is there something simpler as I don't want to really worry about enabling the CURL php extension? In addition, will the below start the PHP script and then just come back and not wait for it to finish? //set GET variables $url = 'http://domain.com/get-post.php'; $fields = array( 'lname'=>urlencode($last_name), 'fname'=>urlencode($first_name) ); //url-ify the data for the GET foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; } rtrim($fields_string,'&'); //open connection $ch = curl_init(); //set the url, number of POST vars, POST data curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_GET,count($fields)); curl_setopt($ch,CURLOPT_GETFIELDS,$fields_string); //execute GET $result = curl_exec($ch); //close connection curl_close($ch); I want to run the other script which contains functions when a condition is met so a simple include won't work as the if condition wraps around the functions, right? Please note, I am on windows machine and the code I am writing will only be used on a Windows OS. Thanks all for any help and advice

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jQuery ajax request response is empty in Internet Explorer

- by Aprilia1982

Hi, I'm doing the following ajax call: //exif loader function LoadExif(cImage) { $.ajax({ type: "POST", url: "http://localhost:62414/Default1.aspx/GetImageExif", data: "{iCurrentImage:" + cImage + "}", contentType: "application/json; charset=utf-8", dataType: "json", error: ajaxFailed, success: function (data, status) { var sStr = ''; for (var count in data.d) { sStr = sStr + data.d[count]; }; alert(sStr); } }); }; In Firefox the request works really fine. When I try to run the code in Internet Explorer, the response is empty. Here is the webmethod witch is called: <WebMethod()> _ <ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _ Public Shared Function GetImageExif(ByVal iCurrentImage As Integer) As String Dim sbTable As New StringBuilder sbTable.AppendLine("<table>") sbTable.AppendLine("<tr>") sbTable.AppendLine("<td>Name</td><td>" & gGallery.Images(iCurrentImage).File.Name & "</td>") sbTable.AppendLine("</tr>") sbTable.AppendLine("</table>") Return sbTable.ToString End Function Any ideas? Jan

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Best Practical RT, sorting email into queues automatically using procmail

- by user52095

I'm trying to get incoming e-mail to automatically go directly into whichever queue/ticket they are related to or create a new one if none exist and the right queue e-mail setup in the web interface is used. I will have too many queues to have two line items within mailgate per queue. A similar issue was discussed here (http://serverfault.com/questions/104779/procmail-pipe-to-program-otherwise-return-error-to-sender), but I thought it best to open a new case instead of tagging on what appeared to be an answer to that person's query. I'm able to send and receive e-mail (via PostFix) to the default rt user and this user successfully accepts all e-mail for the relative domain. I have no idea where the e-mail goes - it's successfully delivered, but it does not update existing tickets (with a Subject line match) and it does not create any new. Here's and example of my ./procmail.log: procmail: [23048] Mon Aug 23 14:26:01 2010 procmail: Assigning "MAILDOMAIN=rt.mydomain.com " procmail: Assigning "RT_MAILGATE=/opt/rt3/bin/rt-mailgate " procmail: Assigning "RT_URL=http://rt.mydomain.com/ " procmail: Assigning "LOGABSTRACT=all " procmail: Skipped " " procmail: Skipped " " procmail: Assigning "LASTFOLDER={ " procmail: Opening "{ " procmail: Acquiring kernel-lock procmail: Notified comsat: "rt@18337:./{ " From [email protected] Mon Aug 23 14:26:01 2010 Subject: RE: [RT.mydomain.com #1] Test Ticket Folder: { 1616 Does the notified comsat portion mean that it notified RT? The contents of my ./procmailrc: #Preliminaries SHELL=/bin/sh #Use the Bourne shell (check your path!) #MAILDIR=${HOME} #First check what your mail directory is! MAILDIR="/var/mail/rt/" LOGFILE="home/rt//procmail.log" LOG="--- Logging ${LOGFILE} for ${LOGNAME}, " VERBOSE=yes MAILDOMAIN="rt.mydomain.com" RT_MAILGATE="/opt/rt3/bin/rt-mailgate" #RT_MAILGATE="/usr/local/bin/rt-mailgate" RT_URL="http://rt.mydomain.com/" LOGABSTRACT=all :0 { # the following line extracts the recipient from Received-headers. # Simply using the To: does not work, as tickets are often created # by sending a CC/BCC to RT TO=`formail -c -xReceived: |grep $MAILDOMAIN |sed -e 's/.*for *<*$.*$>* *;.*$/\1/'` QUEUE=`echo $TO| $HOME/get_queue.pl` ACTION=`echo $TO| $HOME/get_action.pl` :0 h b w |/usr/bin/perl $RT_MAILGATE --queue $QUEUE --action $ACTION --url $RT_URL } I know that my get_queue.pl and get_action.pl scripts work, as those have been previously tested. Any help and/or guidance you can give would be greatly appreciated. Nicôle

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apache requests failing

- by Josh

I'm trying to figure out why sometimes the client fails to load objects/requests from a dynamic page served from Apache/MySql/Debian machine. Let's say 13 objects are to be loaded for a total of 185.3 KB load, with no external objects (no DNS lookups) and no other traffic at the same time, randomly some of those object do not load. However, if I perform a refresh, sometimes all of them load or some might fail again. I only have 1Mbps/up and my DNS is been hosted externally (everydns). What could be the reason of this issue? Any comments will be appreciated.

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What happens when a HTTP request is terminated prematurely?

- by Gowtham

Suppose, I enter a URL in my browser and browser submits the HTTP request. The remote HTTP server accepts the request and initiates a long task to serve the request. If I terminate the request before it is complete (for example, press Esc or in Firefox), how is the request closed? Will the browser communicate this abort request to the server (I think it doesn't)? Presuming no, upon completion of the long task, what will the server do with the result? Does it send it back anyway? If it does, what will happen? Does it reach till my PC? Or gets lost on the way? This is just for my curiosity. Thanks for your time :)

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Polling performance on shared host

- by Azincourt

I am planning on writing a small browser game. The webserver is a shared server, with no root / install possible. I want to use AJAX for client/server communication. There will be 12 players. So each player would be polling the server for the current game status every X milliseconds (let's say 200ms). So that would be 200ms x 12 players x 5 = 60 requests per second Can Apache handle those requests? What might be the bottlenecks when using this attempt?

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if I define `my_domain`, postfix does not expand mail aliases

- by Norky

I have postfix v2.6.6 running on CentOS 6.3, hostname priest.ocsl.local (private, internal domain) with a number of aliases supportpeople: [email protected], [email protected], [email protected] requests: "|/opt/rt4/bin/rt-mailgate --queue 'general' --action correspond --url http://localhost/", supportpeople help: "|/opt/rt4/bin/rt-mailgate --queue 'help' --action correspond --url http://localhost/", supportpeople If I leave postfix with its default configuration, then the aliases are resolved correctly/as I expect, so that incoming mail to, say, [email protected] will be piped through the rt-mailgate mailgate command and also be delivered (via the mail server for ocsl.co.uk (a publicly resolvable domain)) to [email protected], user2, etc. The problem comes when I define mydomain = ocsl.co.uk in /etc/postfix/main.cf (with the intention that outgoing mail come from, for example, [email protected]). When I do this, postfix continues to run the piped command correctly, however it no longer expands the nested aliases as I expect: instead of trying to deliver to [email protected], user2 etc, it tries to send to [email protected], which does not exist on the upstream mail server and generates NDRs. postconf -n for the non-working configuration follows (the working configuration differs only by the "mydomain" line. alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost mydomain = ocsl.co.uk newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop unknown_local_recipient_reject_code = 550 We did have things working as we expected/wanted previously on an older system running Sendmail.

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C# remote web request certificate error

- by Ben

Hi. I am currently integrating a payment gateway into an application. Following a successful transaction the remote payment gateway posts details of the transaction back to my application (ITN). It posts to a HttpHandler that is used to read and validate the data. Part of the validation performed is a POST made by the handler to a validation service provided by the payment gateway. This effectively posts some of the original form values received back to the payment gateway to ensure they are valid. The url that I am posting back to is: "https://sandbox.payfast.co.za/eng/query/validate" and the code I am using: /// <summary> /// Posts the data back to the payment processor to validate the data received /// </summary> public static bool ValidateITNRequestData(NameValueCollection formVariables) { bool isValid = true; try { using (WebClient client = new WebClient()) { string validateUrl = (UseSandBox) ? SandboxValidateUrl : LiveValidateUrl; byte[] responseArray = client.UploadValues(validateUrl, "POST", formVariables); // get the resposne and replace the line breaks with spaces string result = Encoding.ASCII.GetString(responseArray); result = result.Replace("\r\n", " ").Replace("\r", "").Replace("\n", " "); if (result == null || !result.StartsWith("VALID")) { isValid = false; LogManager.InsertLog(LogTypeEnum.OrderError, "PayFast ITN validation failed", "The validation response was not valid."); } } } catch (Exception ex) { LogManager.InsertLog(LogTypeEnum.Unknown, "Unable to validate ITN data. Unknown exception", ex); isValid = false; } return isValid; } However, on calling WebClient.UploadValues the following exception is raised: System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure. at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception) at For the sake of brevity I haven't listed the full call stack (I can do if anyone thinks it will help). The remote certificate does appear to be valid. To get around the problem I did try adding a new RemoteCertificateValidationCallback that always returned true but just ended up getting the following exception: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.Net.ServicePointManager.set_ServerCertificateValidationCallback(RemoteCertificateValidationCallback value) at NopSolutions.NopCommerce.Payment.Methods.PayFast.PayFastPaymentProcessor.ValidateITNRequestData(NameValueCollection formVariables) The action that failed was: Demand The type of the first permission that failed was: System.Security.Permissions.SecurityPermission The Zone of the assembly that failed was: MyComputer So I am not sure this will work in medium trust? Any help would be much appreciated. Thanks Ben

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How to get BinarySecurityToken into the wcf soap request

- by Mr Bell

I need to sign my soap request to a 3rd party. The provided an example what the call should look like. And I am trying, rather unsuccessfully to make this call with wcf. I need to make a wcf soap call where the header contains BinarySecurityToken, Signature, and SecurityTokenReference. Here is the example they sent me (with some of the values omitted) I have a certificate for signing, but I cant for the life of me figure out how to make this work <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><soapenv:Header><wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"> <wsse:BinarySecurityToken EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" wsu:Id="SecurityToken-..omitted.." xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">..omitted..</wsse:BinarySecurityToken> <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> <ds:SignedInfo> <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/> <ds:Reference URI="#Body"> <ds:Transforms> <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> </ds:Transforms> <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> <ds:DigestValue>..omitted...</ds:DigestValue> </ds:Reference> </ds:SignedInfo> <ds:SignatureValue> ..omitted.. </ds:SignatureValue> <ds:KeyInfo><wsse:SecurityTokenReference><wsse:Reference URI="#SecurityToken-..omitted.." ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/></wsse:SecurityTokenReference></ds:KeyInfo></ds:Signature></wsse:Security></soapenv:Header><soapenv:Body wsu:Id="Body"><in0 xmlns="http://test.3rdParty.com">123</in0></soapenv:Body></soapenv:Envelope>

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WCF XmlSerializer assembly not speeding up first request

- by Matt Dearing

I am generating proxy classes to a clients java webservice wsdls and xsd files with svcutil. The first call made to each service proxy class takes a very long time. I was hoping to speed this up by generating the XmlSerializers assembly myself (based on the article How to: Improve the Startup Time of WCF Client Applications using the XmlSerializer), but when I do the first call to each service still takes the same amount of time. Here are the steps I am following: //generate strong name key file sn -k Blah.snk //generate the proxy class file svcutil blah.wsdl blah2.wsdl blah3.wsdl ... base.xsd blah.xsd ... /UseSerializerForFaults /ser:XmlSerializer /n:*,SomeNamespace /out:Blah.cs //compile the class into an assembly signing it with the strong name key file csc /target:library /keyfile:Blah.snk /out:Blah.dll Blah.cs //generate the XmlSerializer code this will give us Blah.XmlSerializers.dll.cs svcutil /t:xmlSerializer Blah.dll //compile the xmlserializer code into its own dll using the same key to sign it and referencing the original dll csc /target:library /keyfile:Blah.snk /out:Blah.XmlSerializers.dll Blah.XmlSerializers.dll.cs /r:Blah.dll I then create a standard Console application that references both Blah.dll and Blah.XmlSerializers.dll. I will then try something like: //BlahProxy is one of the generated service proxy classes BlahProxy p = new BlahProxy(); //this call takes 30ish seconds p.SomeMethod(); BlahProxy p2 = new BlahProxy(); //this call takes < 1 second p2.SomeMethod(); //BlahProx2y is one of the generated service proxy classes BlahProxy2 p3 = new BlahProxy2(); //this call takes 30ish seconds p3.SomeMethod(); BlahProxy2 p4 = new BlahProxy2(); //this call takes < 1 second p4.SomeMethod(); I know that the problem is not server side because I don't see the request made in Fiddler until around 29 seconds. Subsequent calls to each service take < 1 second, so thats why I was hoping the main slow down was the .net runtime generating the xmlserializer code itself, compiling it and loading the assembly. I figured this would be the reason the first call to each service is slow and the rest are fast. Unfortunatley, me generating the code myself is not speeding anything up. Does anyone see what I am doing wrong?

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The remote server returned an error: (400) Bad Request

- by pravakar

Hi, I am getting the following errors: "The remote server returned an error: (400) Bad Request" "Requested time out" sometimes when connecting to a host using a web service. If the XML returned is 5 kb then it is working fine, but if the size is 450kb or above it is displaying the error. Below is my code as well as the config file that resides at the client system. We don't have access to the settings of the server. Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim fileName As String = Server.MapPath("capitaljobs2.xml") Dim client = New CapitalJobsService.DataServiceClient("WSHttpBinding_IDataService", "http://xyz/webservice.svc") Dim userAccount = New UserAccount() 'replace here Dim jobAdList = client.GetProviderJobs(userAccount) '## Needed only to create XML files - do not ucomment - will overwrite files 'if (jobAdList != null) ' SerialiseJobAds(fileName, jobAdList); '## Read new ads from Xml file Dim capitalJobsList = DeserialiseJobdAds(fileName) UpdateProviderJobsFromXml(client, userAccount, capitalJobsList) client.Close() End Sub Private Shared Function DeserialiseJobdAds(ByVal fileName As String) As CapitalJobsService.CapitalJobsList Dim capitalJobsList As CapitalJobsService.CapitalJobsList ' Deserialize the data and read it from the instance If File.Exists(fileName) Then Dim fs = New FileStream(fileName, FileMode.Open) Dim reader = XmlDictionaryReader.CreateTextReader(fs, New XmlDictionaryReaderQuotas()) Dim ser2 = New DataContractSerializer(GetType(CapitalJobsList)) capitalJobsList = DirectCast(ser2.ReadObject(reader, True), CapitalJobsList) reader.Close() fs.Close() Return capitalJobsList End If Return Nothing End Function And the config file <system.web> <httpRuntime maxRequestLength="524288" /> </system.web> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IDataService" closeTimeout="00:10:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="2000000" maxStringContentLength="2000000" maxArrayLength="2000000" maxBytesPerRead="2000000" maxNameTableCharCount="2000000" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm=""/> <message clientCredentialType="Windows" negotiateServiceCredential="true" establishSecurityContext="true"/> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://xyz/DataService.svc" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IDataService" contract="CapitalJobsService.IDataService" name="WSHttpBinding_IDataService"> <identity> <dns value="localhost"/> </identity> </endpoint> </client> </system.serviceModel> I am using "Fiddler" to track the activities it is reading and terminating file like * FIDDLER: RawDisplay truncated at 16384 characters. Right-click to disable truncation. * But in config the number 16348 is not mentioned anywhere. Can you figure out if the error is on client or server side? The settings above are on the client side. Thanks in advance.

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Java Http request on api.stackexchange with json response

- by taoder

I'm trying to use the api-stackexchange with java but when I do the request and try to parse the response with a json parser I have an error. public ArrayList<Question> readJsonStream(InputStream in) throws IOException { JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8")); reader.setLenient(true); try { System.out.println(reader.nextString()); // ? special character return readItem(reader); } finally { reader.close(); } } public ArrayList<Question> readItem(JsonReader reader) throws IOException { ArrayList<Question> questions = new ArrayList<Question>(); reader.beginObject(); while (reader.hasNext()) { System.out.println("here");//not print the error is before String name = reader.nextName(); if (name.equals("items")) { questions = readQuestionsArray(reader); } } reader.endObject(); return questions; } public final static void main(String[] args) throws Exception { URIBuilder builder = new URIBuilder(); builder.setScheme("http").setHost("api.stackexchange.com").setPath("/2.0/search") .setParameter("site", "stackoverflow") .setParameter("intitle" ,"workaround") .setParameter("tagged","javascript"); URI uri = builder.build(); String surl = fixEncoding(uri.toString()+"&filter=!)QWRa9I-CAn0PqgUwq7)DVTM"); System.out.println(surl); Test t = new Test(); try { URL url = new URL(surl); t.readJsonStream(url.openStream()); } catch (IOException e) { e.printStackTrace(); } } And the error is: com.google.gson.stream.MalformedJsonException: Expected literal value at line 1 column 19 Here is an example of the Json : { "items": [ { "question_id": 10842231, "score": 0, "title": "How to push oath token to LocalStorage or LocalSession and listen to the Storage Event? (SoundCloud Php/JS bug workaround)", "tags": [ "javascript", "javascript-events", "local-storage", "soundcloud" ], "answers": [ { "question_id": 10842231, "answer_id": 10857488, "score": 0, "is_accepted": false } ], "link": "http://stackoverflow.com/questions/10842231/how-to-push-oath-token-to-localstorage-or-localsession-and-listen-to-the-storage", "is_answered": false },... So what's the problem? Is the Json really malformed? Or did I do something not right? Thanks, Anthony

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Sharepoint web services -- The HTTP request is unauthorized with client authentication scheme 'Ntlm'

- by Pandincus

I know there's a lot of questions on SO similar to this, but I couldn't find one for this particular issue. A couple of points, first: I have no control over our Sharepoint server. I cannot tweak any IIS settings. I believe our IIS server version is IIS 7.0. Our Sharepoint Server is anticipating requests via NTLM. Our Sharepoint Server is on the same domain as my client computer. I am using .NET Framework 3.5, Visual Studio 2008 I am trying to write a simple console app to manipulate Sharepoint data using Sharepoint Web Services. I have added the Service Reference, and the following is my app.config: <system.serviceModel> <bindings> <basicHttpBinding> <binding name="ListsSoap" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <security mode="Transport"> <transport clientCredentialType="Ntlm" proxyCredentialType="Ntlm" /> </security> </binding> </basicHttpBinding> </bindings> <client> <endpoint address="https://subdomain.companysite.com/subsite/_vti_bin/Lists.asmx" binding="basicHttpBinding" bindingConfiguration="ListsSoap" contract="ServiceReference1.ListsSoap" name="ListsSoap" /> </client> </system.serviceModel> This is my code: static void Main(string[] args) { using (var client = new ListsSoapClient()) { client.ClientCredentials.Windows.ClientCredential = new NetworkCredential("username", "password", "domain"); client.GetListCollection(); } } When I call GetListCollection(), the following MessageSecurityException gets thrown: The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'NTLM'. With an inner WebException: "The remote server returned an error: (401) Unauthorized." I've tried various bindings and various code tweaks to try to authenticate properly, but to no avail. I'll list those below. I've tried the following steps: Using a native Win32 Impersonator before creating the client using (new Impersonator.Impersonator("username", "password", "domain")) using (var client = new ListsSoapClient()) { client.ClientCredentials.Windows.ClientCredential = new NetworkCredential("dpincas", "password", "domain"); client.GetListCollection(); } This produced the same error message. Setting TokenImpersonationLevel for my client credentials using (var client = new ListsSoapClient()) { client.ClientCredentials.Windows.AllowedImpersonationLevel = TokenImpersonationLevel.Impersonation; client.GetListCollection(); } This produced the same error message. Using security mode=TransportCredentialOnly <security mode="TransportCredentialOnly"> <transport clientCredentialType="Ntlm" /> </security> This resulted in a different error message: The provided URI scheme 'https' is invalid; expected 'http'. Parameter name: via However, I need to use https, so I cannot change my URI scheme. I've tried some other combinations that I can't remember, but I'll post them when I do. I'm really at wits end here. I see a lot of links on Google that say "switch to Kerberos", but my server seems to only be accepting NTLM, not "Negotiate" (as it would say if it was looking for Kerberos), so that is unfortunately not an option. Any help out there, folks?

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How to intercept raw soap request/response (data) from WCF client

- by JohnIdol

This question seems to be pretty close to what I am looking for - I was able to setup tracing and I am looking at the log entries for my calls to the service. However I need to see the raw soap request with the data I am sending to the service and I see no way of doing that from the SvcTraceViewer (only log entries are shown but no data sent to the service) - am I just missing configuration? Here's what I got in my web.config: <system.diagnostics> <sources> <source name="System.ServiceModel" switchValue="Verbose" propagateActivity="true"> <listeners> <add name="sdt" type="System.Diagnostics.XmlWriterTraceListener" initializeData="App_Data/Logs/WCFTrace.svclog" /> </listeners> </source> </sources> </system.diagnostics> Any help appreciated! UPDATE: this is all I see in my trace: <E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"> <System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"> <EventID>262163</EventID> <Type>3</Type> <SubType Name="Information">0</SubType> <Level>8</Level> <TimeCreated SystemTime="2010-05-10T13:10:46.6713553Z" /> <Source Name="System.ServiceModel" /> <Correlation ActivityID="{00000000-0000-0000-1501-0080000000f6}" /> <Execution ProcessName="w3wp" ProcessID="3492" ThreadID="23" /> <Channel /> <Computer>MY_COMPUTER_NAME</Computer> </System> <ApplicationData> <TraceData> <DataItem> <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Information"> <TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Channels.MessageSent.aspx</TraceIdentifier> <Description>Sent a message over a channel.</Description> <AppDomain>MY_DOMAIN</AppDomain> <Source>System.ServiceModel.Channels.HttpOutput+WebRequestHttpOutput/50416815</Source> <ExtendedData xmlns="http://schemas.microsoft.com/2006/08/ServiceModel/MessageTraceRecord"> <MessageProperties> <Encoder>text/xml; charset=utf-8</Encoder> <AllowOutputBatching>False</AllowOutputBatching> <Via>http://xxx.xx.xxx.xxx:9080/MyWebService/myService</Via> </MessageProperties> <MessageHeaders></MessageHeaders> </ExtendedData> </TraceRecord> </DataItem> </TraceData> </ApplicationData>

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HTTP Bad Request error when requesting a WCF service contract

- by Enrico Campidoglio

I have a WCF service with the following configuration: <system.serviceModel> <behaviors> <serviceBehaviors> <behavior name="MetadataEnabled"> <serviceDebug includeExceptionDetailInFaults="true" /> <serviceMetadata httpGetEnabled="true" /> </behavior> </serviceBehaviors> </behaviors> <services> <service behaviorConfiguration="MetadataEnabled" name="MyNamespace.MyService"> <endpoint name="BasicHttp" address="" binding="basicHttpBinding" contract="MyNamespace.IMyServiceContract" /> <endpoint name="MetadataHttp" address="contract" binding="mexHttpBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="http://localhost/myservice" /> </baseAddresses> </host> </service> </services> </system.serviceModel> When hosting the service in the WcfSvcHost.exe process, if I browse to the URL: http://localhost/myservice/contract where the service metadata is available I get an HTTP 400 Bad Request error. By inspecting the WCF logs I found out that an System.Xml.XmlException exception is being thrown with the message: "The body of the message cannot be read because it is empty."Here is an extract of the log file: <Exception> <ExceptionType> System.ServiceModel.ProtocolException, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 </ExceptionType> <Message>There is a problem with the XML that was received from the network. See inner exception for more details.</Message> <StackTrace> at System.ServiceModel.Channels.HttpRequestContext.CreateMessage() at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, ItemDequeuedCallback callback) at System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContextCore(IAsyncResult result) at System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContext(IAsyncResult result) at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.Net.LazyAsyncResult.Complete(IntPtr userToken) at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken) at System.Net.ListenerAsyncResult.WaitCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) </StackTrace> <InnerException> <ExceptionType>System.Xml.XmlException, System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType> <Message>The body of the message cannot be read because it is empty.</Message> <StackTrace> at System.ServiceModel.Channels.HttpRequestContext.CreateMessage() at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, ItemDequeuedCallback callback) at System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContextCore(IAsyncResult result) at System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContext(IAsyncResult result) at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.Net.LazyAsyncResult.Complete(IntPtr userToken) at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken) at System.Net.ListenerAsyncResult.WaitCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) </StackTrace> </InnerException> </Exception> If I instead browse to the URL: http://localhost/myservice?wsdl everything works just fine and I get the WSDL contract. At this point, I can also remove the "MetadataHttp" metadata endpoint completely, and it wouldn't make any difference. I'm using .NET 3.5 SP1. Does anyone have an idea of what could be wrong here?

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The remote server returned an unexpected response: (400) Bad Request while streaming

- by phenevo

Hi, I have problem with streaming. When I send small file like 1kb txt everything is ok, but when I send larger file like 100 kb jpg or 2gb psd I get: The remote server returned an unexpected response: (400) Bad Request. I'm using windows 7, VS 2010 and .net 3.5 and WCF Service library I lost all my weekend on this and I still see this error :/ Please help me Client: var client = new WpfApplication1.ServiceReference1.Service1Client("WSHttpBinding_IService1"); client.GetString("test"); string filename = @"d:\test.jpg"; FileStream fs = new FileStream(filename, FileMode.Open); try { client.ProcessStreamFromClient(fs); } catch (Exception exception) { Console.WriteLine(exception); } app.config: <?xml version="1.0" encoding="utf-8" ?> <configuration> <system.serviceModel> <bindings> <basicHttpBinding> <binding name="StreamedHttp" closeTimeout="10:01:00" openTimeout="10:01:00" receiveTimeout="10:10:00" sendTimeout="10:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536000" maxBufferPoolSize="524288000" maxReceivedMessageSize="65536000" messageEncoding="Text" textEncoding="utf-8" transferMode="Streamed" useDefaultWebProxy="true"> <readerQuotas maxDepth="0" maxStringContentLength="0" maxArrayLength="0" maxBytesPerRead="0" maxNameTableCharCount="0" /> <security mode="None"> <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> <message clientCredentialType="UserName" algorithmSuite="Default" /> </security> </binding> </basicHttpBinding> </bindings> <client> <endpoint address="http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary2/Service1/" binding="basicHttpBinding" bindingConfiguration="StreamedHttp" contract="ServiceReference1.IService1" name="WSHttpBinding_IService1" /> </client> </system.serviceModel> </configuration> And Wcf ServiceLibrary: public void ProcessStreamFromClient(Stream str) { using (var outStream = new FileStream(@"e:\test.jpg", FileMode.Create)) { var buffer = new byte[4096]; int count; while ((count = str.Read(buffer, 0, buffer.Length)) > 0) { outStream.Write(buffer, 0, count); } } } App.config <?xml version="1.0" encoding="utf-8" ?> <configuration> <system.web> <compilation debug="true" /> </system.web>  <system.serviceModel> <bindings> <basicHttpBinding> <binding name="Binding1" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536000" transferMode="Streamed" bypassProxyOnLocal="false" closeTimeout="10:01:00" openTimeout="10:01:00" receiveTimeout="10:10:00" sendTimeout="10:01:00" maxBufferPoolSize="524288000" maxReceivedMessageSize="65536000" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <security mode="None" /> </binding> </basicHttpBinding> </bindings> <client /> <services> <service name="WcfServiceLibrary2.Service1"> <host> <baseAddresses> <add baseAddress="http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary2/Service1/" /> </baseAddresses> </host>   <endpoint address="" binding="basicHttpBinding" contract="WcfServiceLibrary2.IService1">  <identity> <dns value="localhost"/> </identity> </endpoint>    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior>  <serviceMetadata httpGetEnabled="True"/>  <dataContractSerializer maxItemsInObjectGraph="2147483647"/>  <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration>

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jQuery Form Processing With PHP to MYSQL Database Using $.ajax Request

- by FrustratedUser

Question: How can I process a form using jQuery and the $.ajax request so that the data is passed to a script which writes it to a database? Problem: I have a simple email signup form that when processed, adds the email along with the current date to a table in a MySQL database. Processing the form without jQuery works as intended, adding the email and date. With jQuery, the form submits successfully and returns the success message. However, no data is added to the database. Any insight would be greatly appreciated!  <?php // DB info $dbhost = '#'; $dbuser = '#'; $dbpass = '#'; $dbname = '#'; // Open connection to db $conn = mysql_connect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql'); mysql_select_db($dbname); // Form variables $email = $_POST['email']; $submitted = $_POST['submitted']; // Clean up function cleanData($str) { $str = trim($str); $str = strip_tags($str); $str = strtolower($str); return $str; } $email = cleanData($email); $error = ""; if(isset($submitted)) { if($email == '') { $error .= '<p class="error">Please enter your email address.</p>' . "\n"; } else if (!eregi("^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$", $email)) { $error .= '<p class="error">Please enter a valid email address.</p>' . "\n"; } if(!$error){ echo '<p id="signup-success-nojs">You have successfully subscribed!</p>'; // Add to database $add_email = "INSERT INTO subscribers (email,date) VALUES ('$email',CURDATE())"; mysql_query($add_email) or die(mysql_error()); }else{ echo $error; } } ?>  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Sample</title> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ // Email Signup $("form#newsletter").submit(function() { var dataStr = $("#newsletter").serialize(); alert(dataStr); $.ajax({ type: "POST", url: "process.php", data: dataStr, success: function(del){ $('form#newsletter').hide(); $('#signup-success').fadeIn(); } }); return false; }); }); </script> <style type="text/css"> #email { margin-right:2px; padding:5px; width:145px; border-top:1px solid #ccc; border-left:1px solid #ccc; border-right:1px solid #eee; border-bottom:1px solid #eee; font-size:14px; color:#9e9e9e; } #signup-success { margin-bottom:20px; padding-bottom:10px; background:url(../img/css/divider-dots.gif) repeat-x 0 100%; display:none; } #signup-success p, #signup-success-nojs { padding:5px; background:#fff; border:1px solid #dedede; text-align:center; font-weight:bold; color:#3d7da5; } </style> </head> <body> <?php include('process.php'); ?> <form id="newsletter" class="divider" name="newsletter" method="post" action=""> <fieldset> <input id="email" type="text" name="email" /> <input id="submit-button" type="image" src="<?php echo $base_url; ?>/assets/img/css/signup.gif" alt=" SIGNUP " /> <input id="submitted" type="hidden" name="submitted" value="true" /> </fieldset> </form> <div id="signup-success"><p>You have successfully subscribed!</p></div> </body> </html>

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migrating from Prototype to jQuery in Rails, having trouble with duplicate get request

- by aressidi

I'm in the process of migrating from Prototype to jQuery and moving all JS outside of the view files. All is going fairly well with one exception. Here's what I'm trying to do, and the problem I'm having. I have a diary where users can update records in-line in the page like so: user clicks 'edit' link to edit an entry in the diary a get request is performed via jQuery and an edit form is displayed allowing the user to modify the record user updates the record, the form disappears and the updated record is shown in place of the form All of that works so far. The problem arises when: user updates a record user clicks 'edit' to update another record in this case, the edit form is shown twice! In firebug I get a status code 200 when the form shows, and then moments later, another edit form shows again with a status code of 304 I only want the form to show once, not twice. The form shows twice only after I update a record, otherwise everything works fine. Here's the code, any ideas? I think this might have to do with the fact that in food_item_update.js I call the editDiaryEntry() after a record is updated, but if I don't call that function and try and update the record after it's been modified, then it just spits up the .js.erb response on the screen. That's also why I have the editDiaryEntry() in the add_food.js.erb file. Any help would be greatly appreciated. diary.js jQuery(document).ready(function() { postFoodEntry(); editDiaryEntry(); initDatePicker(); }); function postFoodEntry() { jQuery('form#add_entry').submit(function(e) { e.preventDefault(); jQuery.post(this.action, jQuery(this).serialize(), null, "script"); // return this }); } function editDiaryEntry() { jQuery('.edit_link').click(function(e) { e.preventDefault(); // This should look to see if one version of this is open... if (jQuery('#edit_container_' + this.id).length == 0 ) { jQuery.get('/diary/entry/edit', {id: this.id}, null, "script"); } }); } function closeEdit () { jQuery('.close_edit').click(function(e) { e.preventDefault(); jQuery('.entry_edit_container').remove(); jQuery("#entry_" + this.id).show(); }); } function updateDiaryEntry() { jQuery('.edit_entry_form').submit(function(e) { e.preventDefault(); jQuery.post(this.action, $(this).serialize(), null, "script"); }); } function initDatePicker() { jQuery("#date, #edit_date").datepicker(); }; add_food.js.erb jQuery("#entry_alert").show(); jQuery('#add_entry')[ 0 ].reset(); jQuery('#diary_entries').html("<%= escape_javascript(render :partial => 'members/diary/diary_entries', :object => @diary, :locals => {:record_counter => 0, :date_header => 0, :edit_mode => @diary_edit}, :layout => false ) %>"); jQuery('#entry_alert').html("<%= escape_javascript(render :partial => 'members/diary/entry_alert', :locals => {:type => @type, :message => @alert_message}) %>"); jQuery('#entry_alert').show(); setTimeout(function() { jQuery('#entry_alert').fadeOut('slow'); }, 5000); editDiaryEntry(); food_item_edit.js.erb jQuery("#entry_<%= @entry.id %>").hide(); jQuery("#entry_<%= @entry.id %>").after("<%= escape_javascript(render :partial => 'members/diary/food_item_edit', :locals => {:user_food_profile => @entry}) %>"); closeEdit(); updateDiaryEntry(); initDatePicker(); food_item_update.js jQuery("#entry_<%= @entry.id %>").replaceWith("<%= escape_javascript(render :partial => 'members/diary/food_item', :locals => {:entry => @entry, :total_calories => 0}) %>"); jQuery('.entry_edit_container').remove(); editDiaryEntry();

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Java HTTP Requests Buffer size

- by behrk2

Hello, I have an HTTP Request Dispatcher class that works most of the time, but I had noticed that it "stalls" when receiving larger requests. After looking into the problem, I thought that perhaps I wasn't allocating enough bytes to the buffer. Before, I was doing: byte[] buffer = new byte[10000]; After changing it to 20000, it seems to have stopped stalling: String contentType = connection.getHeaderField("Content-type"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); InputStream responseData = connection.openInputStream(); byte[] buffer = new byte[20000]; int bytesRead = responseData.read(buffer); while (bytesRead > 0) { baos.write(buffer, 0, bytesRead); bytesRead = responseData.read(buffer); } baos.close(); connection.close(); Am I doing this right? Is there anyway that I can dynamically set the number of bytes for the buffer based on the size of the request? Thanks...

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Calendar booking issue - Exchange 2003 and 2010

- by NaOH

In our organization we are running Exchange 2003 and 2010 simultaneously, with the hopes of migrating everyone to Exchange 2010 sometime within the next few months. Everyone is using Outlook 2010. Recently, we had an issue with transaction log storage on the Exchange 2003 server. This was resolved, but for some reason no meeting rooms on the Exchange 2003 server will automatically book meetings any longer. I have played around with this for a while, changing calendar permissions, turning resource scheduling off and back on, etc. No dice. My next step was to try migrating a resource to the Exchange 2010 server. After doing so, and setting it up as a Room, enabling Auto-Accept and removing the EnableDirectBooking registry entry on my PC, I can book a meeting with this room. If EnableDirectBooking is enabled, I get an error message stating: "Meeting Room" declined your meeting because it is recurring. You must book each meeting separately with this resource. This is despite the fact that the meeting I'm attempting to create has no recurrence. Now, I have also created a new test Room from scratch on the Exchange 2010 server, and I can book a meeting with this Room regardless of whether or not I have the EnableDirectBooking reg entry in place. All users here have this registry entry, and I'd rather not have to figure out how to push something out to remove it from every PC. Rather, I'd like to figure out what's different between the configurations of these two meeting rooms so that I could book a meeting room regardless of whether EnableDirectBooking is enabled or not. Any ideas, anyone? Thanks!

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Chache problem running two consecutive HTTP GET requests from an APP1 to an APP2

- by user502052

I use Ruby on Rails 3 and I have 2 applications (APP1 and APP2) working on two subdomains: app1.domain.local app2.domain.local and I am tryng to run two consecutive HTTP GET requests from APP1 to APP2 like this: Code in APP1 (request): response1 = Net::HTTP.get( URI.parse("http://app2.domain.local?test=first&id=1") ) response2 = Net::HTTP.get( URI.parse("http://app2.domain.local/test=second&id=1") ) Code in APP2 (response): respond_to do |format| if <model_name>.find(params[:id]).<field_name> == "first" <model_name>.find(params[:id]).update_attribute ( <field_name>, <field_value> ) format.xml { render :xml => <model_name>.find(params[:id]).<field_name> } elsif <model_name>.find(params[:id]).<field_name> == "second" format.xml { render :xml => <model_name>.find(params[:id]).<field_name> } end end After the first request I get the correct XML (response1 is what I expect), but on the second it isn't (response2 isn't what I expect). Doing some tests I found that the second time that <model_name>.find(params[:id]).<field_name> run (for the elsif statements) it returns always a blank value so that the code in the elseif statement is never run. Is it possible that the problem is related on caching <model_name>.find(params[:id]).<field_name>? P.S.: I read about eTag and Conditional GET, but I am not sure that I must use that approach. I would like to keep all simple.

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Is it possible that two requests at the same time double this code? (prevent double database entry)

- by loostro

1) The controller code (Symfony2 framework): $em = $this->getDoctrine()->getEntityManager(); // get latest toplist $last = $em->getRepository('RadioToplistBundle:Toplist')->findOneBy( array('number' => 'DESC') ); // get current year and week of the year $week = date('W'); $year = date('Y'); // if: // [case 1]: $last is null, meaning there are no toplists in the database // [case 2]: $last->getYear() or $last->getWeek() do not match current // year and week number, meaning that there are toplists in the // database, but not for current week // then: // create new toplist entity (for current week of current year) // else: // do nothing (return) if($last && $last->getYear() == $year && $last->getWeek() == $week) return; else { $new = new Toplist(); $new->setYear($year); $new->setWeek($week); $em->persist($new); $em->flush(); } This code is executed with each request to view toplist results (frontend) or list of toplists (backend). Anytime someone wants to access the toplist we first check if we should create a new toplist entity (for new week). 2) The question is: Is it possible that: User A goes to mydomain.com/toplist at 00:00:01 on Monday - the code should generate new entity the server slows down and it takes him 3 seconds to execute the code so new toplist entity is saved to database at 00:00:04 on Monday User B goes to mydomain.com/toplist at 00:00:02 on Monday at 00:00:02 there the toplist is not yet saved in database, thus UserB's request triggers the code to create another toplist entity And so.. after a few seconds we have 2 toplist entities for current week. Is this possible? How should I prevent this?

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