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  • Splitting an HTTP request into multiple byte-range requests

    - by redpola
    I have arrived at the unusual situation of having two completely independent Internet connections to my home. This has the advantage of redundancy etc but the drawback that both connections max out at about 6Mb/s. So one individual outbound http request is directed by my "intelligent gateway" (TP-LINK ER6120) out over one or the other connection for its lifetime. This works fine over complex web pages and utilises both external connects fine. However, single-http-request downloads are limited to the maximum rate of one of the two connections. So I'm thinking, surely I can setup some kind of proxy server to direct all my http requests to. For each incoming http request, the proxy server will issue multiple byte-range requests for the desired data and manage the reassembly and delivery of that data to the client's request. I can see this has some overhead, and also some edge cases where there will be blocking problems waiting for data. I also imagine webmasters of single-servers would rather I didn't hit them with 8 byte-range requests instead of one request. How can I achieve this http request deconstruct/reconstruction? Or am I just barking mad?

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  • the file 'info.plist' could not be opened because there is no such file

    - by user1609545
    I tried to deploy the app to the iphone device for test.When I pressed the run button, one error accured.pic is attched below. "the file 'Simple-Info.plist' could not be opened because there is no such file".But the file is there in the project! I mentioned the path of the file which was marked in red in the pic.Why there is 2 Simple(the Project name) in the path? Anyone could help?! enter image description here

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  • Parsing every part of an HTTP header field-value

    - by brickner
    Hi all. I'm parsing HTTP data directly from packets (either TCP reconstructed or not, you can assume it is). I'm looking for the best way to parse HTTP as accurately as possible. The main issue here is the HTTP header. Looking at the basic RFC of HTTP/1.1, it seems that HTTP header parsing would be complex. The RFC describes very complex regular expressions for different parts of the header. Should I write these regular expressions to parse the different parts of the HTTP header? The basic parsing I've written so far for HTTP header is for the generic HTTP header: message-header = field-name ":" [ field-value ] And I've included replacing inner LWS with SP and repeating headers with the same field-name with comma separated values as described in section 4.2. However, looking at section 14.9 for example would show that in order to parse the different parts of the field-value I need a much more complex parsing scheme. How do you suggest I should handle the complex parts of HTTP parsing (specifically the field-value) assuming I want to give the parser users the full capabilities of HTTP and to parse every part of HTTP? Design suggestions for this would also be appreciated. Thanks.

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  • OpenVPN - Ubuntu 10.04 - Client Can't Connect to Server - Linux Route Add Command Failed

    - by nicorellius
    I suppose this could be asked on Server Fault as well, but it is specific to the client so I thought I'd start here. I have keys for access to an OpenVPN server already in place. I have used these keys to connect already, but using a Windows XP machine. On a Ubuntu machine, I installed OpenVPN and then configured client.conf file so that I could run: sudo openvpn --config client.conf And it seems correct but I still can't connect and get these errors and lines of output: Mon May 31 14:34:57 2010 ERROR: Linux route add command failed: external program exited with error status: 7 Mon May 31 14:34:57 2010 /sbin/route add -net 10.8.0.1 netmask 255.255.255.255 gw 10.8.0.17 SIOCADDRT: File exists Mon May 31 14:34:57 2010 ERROR: Linux route add command failed: external program exited with error status: 7 Mon May 31 14:34:57 2010 Initialization Sequence Completed I searched the net for forums and ideas and tried some file moving and renaming but still ended up in the same place.

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  • SysAdmin Career Question: Internal or Client Based

    - by Malnizzle
    ServerFault Community, It seems there are two positions SysAdmins find themselves in, either you are working for a non-IT services based single client (your employer) and providing in-house IT support or you work for a company who provides out sourced IT services to multiple clients. Right now I work for a company who does the latter, and I often consider how nice it would be doing the in-house side of things, to just have one network I am focused on and instead of feeling like I have a dozen bosses between clients and internal management, I would just have one set of management and people to appease. There is also the technical aspect of every client wanting something different, and having to manage numerous different technology platforms, or trying to force clients into using the technologies we prefer, neither situation is enjoyable. Is this just "the grass is greener on the other side" syndrome, or is there some legitimacy to the the stress of client based IT work compared to being an in-house IT guy? Thanks!

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  • OpenVPN - Ubunut 10.04 - Client Can't Connect to Server - Linux Route Add Command Failed

    - by nicorellius
    I suppose this could be asked on Server Fault as well, but it is specific to the client so I thought I'd start here. I have keys for a OpenVPN server already in place. I have used these keys to connect already, but using a Windows XP machine. I started by building the client.conf file so that I could run: sudo openvpn --config client.conf And it seems correct but I still can't connect and get these errors and lines of output: Mon May 31 14:34:57 2010 ERROR: Linux route add command failed: external program exited with error status: 7 Mon May 31 14:34:57 2010 /sbin/route add -net 10.8.0.1 netmask 255.255.255.255 gw 10.8.0.17 SIOCADDRT: File exists Mon May 31 14:34:57 2010 ERROR: Linux route add command failed: external program exited with error status: 7 Mon May 31 14:34:57 2010 Initialization Sequence Completed I searched the net for forums and ideas and tried some file moving and renaming but still ended up in the same place.

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  • tomcat start service NoClassDefFoundError?

    - by mobibob
    I am trying to redeploy my server on a new server with a different DNS and IP address. Therefore, I think my problem is in the configuration to find JAR files. Is there a way to get more detail as to which class is being requested so I can narrow down my problem. Does anyone have any suggested troubleshooting guidance for such problem? BTW - the configuration was working on the original server, and I tried to find all the locations in the files: conf/, worker.properties, server.xml, catalina.policy, web.xml. The jarkarta.log repeats the starting... error initializing ... forever. Very boring, therefore, the problem has to be fundamental. Apparently, the error message is recorded in the log across more than one line and would be this: Error occurred during initialization of VM java/lang/NoClassDefFoundError : java/lang/Object [2012-05-21 18:20:33] [info] Procrun (2.0.4.0) started [2012-05-21 18:20:33] [info] Running Service... [2012-05-21 18:20:33] [info] Starting service... [2012-05-21 18:20:33] [info] Error occurred during initialization of VM [2012-05-21 18:20:33] [info] java/lang/NoClassDefFoundError [2012-05-21 18:20:33] [info] : java/lang/Object [2012-05-21 18:21:59] [info] Procrun (2.0.4.0) started [2012-05-21 18:21:59] [info] Running Service... [2012-05-21 18:21:59] [info] Starting service... [2012-05-21 18:21:59] [info] Error occurred during initialization of VM [2012-05-21 18:21:59] [info] java/lang/NoClassDefFoundError [2012-05-21 18:21:59] [info] : java/lang/Object [2012-05-21 18:35:16] [info] Procrun (2.0.4.0) started [2012-05-21 18:35:16] [info] Running Service... [2012-05-21 18:35:16] [info] Starting service... [2012-05-21 18:35:16] [info] Error occurred during initialization of VM [2012-05-21 18:35:16] [info] java/lang/NoClassDefFoundError [2012-05-21 18:35:16] [info] : java/lang/Object [2012-05-21 18:45:25] [info] Procrun (2.0.4.0) started [2012-05-21 18:45:25] [info] Running Service... [2012-05-21 18:45:25] [info] Starting service... [2012-05-21 18:45:25] [info] Error occurred during initialization of VM [2012-05-21 18:45:25] [info] java/lang/NoClassDefFoundError [2012-05-21 18:45:25] [info] : java/lang/Object [2012-05-21 18:46:29] [info] Procrun (2.0.4.0) started [2012-05-21 18:46:29] [info] Running Service... [2012-05-21 18:46:29] [info] Starting service... [2012-05-21 18:46:29] [info] Error occurred during initialization of VM [2012-05-21 18:46:29] [info] java/lang/NoClassDefFoundError

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  • Slow Starting DHCP Client Service - HP Thin Clients

    - by Ryan
    We have recently began adding XPe thin clients to our domain in preperation for a new citrix environment. One thing that has been picked up on in testing is that they appear slow to boot. The issue manifest's it's self as the classic "Applying Computer Settings..." screen we are all used to seeing. After digging into the issue it appears the DHCP Client service is taking some time to load on boot, this varies but I would estimate it can take around 1 minute in some cases. I've eliminated the classic issues, DHCP is responding correctly and in quick time. DNS is not the cause and GPO's are applying promptly. A simple workaround is to assign the client a static IP which work's great so the TCP/IP servies are obviously firing up quickly, just not DHCP Client. Does anyone have any idea's on how I may be able to improve the service start time? Keen to find a better solution before I get my arm twisted into setting up 250 thin clients with static addressing!

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  • Client-based program to track response time for online webservice

    - by Søren Haagerup
    I am helping a customer with general IT support, and they have a problem with a hosted web-based system being slow. The provider of the system blames the client's computer, and the client calls me for help. I blame the provider, but it is hard to get them to do something about it without rock-solid evidence. And every time the provider comes around for a TeamViewer session, everything of course runs smoothly. Does there exist a client program or browser plugin that tracks statistics about response time for specific web services?

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  • .htaccess blocking images on some internal pages

    - by jethomas
    I'm doing some web design for a friend and I noticed that everywhere else on her site images will load fine except for the subdirectory I'm working in. I looked in her .htaccess file and sure enough it is setup to deny people from stealing her images. Fair Enough, except the pages i'm working on are in her domain and yet I still get the 403 error. I'm pasting the .htaccess contents below but I replaced the domain names with xyz, 123 and abc. So specifically the page I'm on (xyz.com/DesignGallery.asp) pulls images from (xyz.com/machform/data/form_1/files) and it results in a forbidden error. RewriteEngine on <Files 403.shtml> order allow,deny allow from all </Files> RewriteCond %{HTTP_REFERER} !^http://xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com/machform/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com/machform/data/form_1/files/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/data/form_1/files/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.xyz.com$ [NC] RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC] deny from 69.49.149.17 RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^vendors\.html$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^vendors\.asp$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^ArtGraphics\.html$ "http\:\/\/www\.xyz\.com\/Art_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^ArtGraphics\.asp$ "http\:\/\/www\.xyz\.com\/Art_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Gear\.asp$ "http\:\/\/www\.xyz\.com\/Gear_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Gear\.html$ "http\:\/\/www\.xyz\.com\/Gear_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^NewsletterSign\-Up\.html$ "http\:\/\/www\.xyz\.com\/Newsletter\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^NewsletterSign\-Up\.asp$ "http\:\/\/www\.xyz\.com\/Newsletter\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^KidzStuff\.html$ "http\:\/\/www\.xyz\.com\/KidzStuff1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^KidzStuff\.asp$ "http\:\/\/www\.xyz\.com\/KidzStuff1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Vendors\.html$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Vendors\.asp$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L]

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  • http://localhost does not work, http://127.0.0.1 works

    - by dskanth
    Iam running Zend with Apache and got to see a strange behaviour.... If i type http://127.0.0.1 in my browser url, it works fine, but after typing: http://localhost, i will get a file download window, saying file type as: application/x-httpd-php And in my httpd.conf file, i have the following under VirtualHost *:80 definition: ServerName localhost DocumentRoot E:\zend\Apache2\htdocs\my_project\public Directory E:\zend\Apache2\htdocs\my_project\public Perhaps some configuration problem... can anyone guide me..

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  • HTTP: can GET and POST requests from a same machine come from different IPs?

    - by NoozNooz42
    I'm pretty sure I remember reading --but cannot find back the links anymore-- about this: on some ISP (including at least one big ISP in the U.S.) it is possible to have a user's GET and POST request appearing to come from different IPs. (note that this is totally programming related, and I'll give an example below) I'm not talking about having your IP adress dynamically change between two requests. I'm talking about this: IP 1: 123.45.67.89 IP 2: 101.22.33.44 The same user makes a GET, then a POST, then a GET again, then a POST again and the servers see this: - GET from IP 1 - POST from IP 2 - GET from IP 1 - POST from IP 2 So altough it's the same user, the webserver sees different IPs for the GET and the POSTs. Surely seen that HTTP is a stateless protocol this is perfectly legit right? I'd like to find back the explanation as to how/why certain ISP have their networks configured such that this may happen. I'm asking because someone asked me to implement the following IP filter and I'm pretty sure it is fundamentally broken code (breaking havoc for at least one major american ISP users). Here's a Java servlet filter that is supposed to protect against some attacks. The reasoning is that: "For any session filter checks that IP address in the request is the same that was used when session was created. So in this case session ID could not be stolen for forming fake sessions." http://www.servletsuite.com/servlets/protectsessionsflt.htm However I'm pretty sure this is inherently broken because there are ISPs where you may see GET and POST coming from different IPs. Any info on this subject is very welcome.

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  • DNS client configuration steps in Oracle Solaris 11

    - by Gurubalan
    This guide covers Quick how to configure DNS client on Solaris 11. DNS client configuration in Solaris 11 is based on SMF service rather than file based. When you configure a system as DNS client, you will be performing the following two configurations. I. DNS client setup II. Configure Name service switch to use DNS I. DNS client setup 1. Configure using SMF service network/dns/client # svccfg -s network/dns/clientsvc:/network/dns/client> setprop config/search = astring: ("test.com" "service.test.com")svc:/network/dns/client> setprop config/nameserver = net_address: (192.168.10.10 192.168.10.11)svc:/network/dns/client> exit 2.  Enable the DNS client service (when you configure it for the first time) #svccfg enable -r dns/client 3. Restart/Refresh DNS client service (It is done when there is any update to the configuration) #svccfg refresh dns/client #svccfg restart dns/client 4. Verify /etc/resolv.conf if it is updated with the changes. # more /etc/resolv.conf ## _AUTOGENERATED_FROM_SMF_V1_## WARNING: THIS FILE GENERATED FROM SMF DATA.#   DO NOT EDIT THIS FILE.  EDITS WILL BE LOST.# See resolv.conf(4) for details.search               test.com service.test.comnameserver      192.168.10.10nameserver      192.168.10.11 --- II.  Configuring Name service switch to use DNS 1. Configure using SMF service  system/name-service/switch # svccfg -s system/name-service/switchsvc:/system/name-service/switch> setprop config/host = astring: "files dns"svc:/system/name-service/switch>exit 2.  Restart/Refresh name-service/switch service #svccfg refresh name-service/switch #svccfg restart  name-service/switch 3. Verfiy host entry in /etc/nsswitch.conf  is updated with dns. # more /etc/nsswitch.conf## _AUTOGENERATED_FROM_SMF_V1_## WARNING: THIS FILE GENERATED FROM SMF DATA.#   DO NOT EDIT THIS FILE.  EDITS WILL BE LOST.# See nsswitch.conf(4) for details.passwd: filesgroup:  fileshosts:  files dnsipnodes:        files dns . --- PS: Thank you ollasi for your motivation behind the screen.

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  • Openvpn client-to-client connection reencrypted at Server?

    - by user1684411
    currently i'm using a site-2-site openvpn setup. The routers en/decrypt all traffic that goes from one net to another. One of them is the Openvpn server. This works but performance is not as good as possible. I think the limiting factor is the cpu power of the router. Would it be better if i use client-to-client connections and access the fileserver in the one net from a pc in the other, because the openvpn-server does not have to decrypt the (whole) packets?

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  • How do you send a HEAD HTTP request in Python?

    - by fuentesjr
    So what I'm trying to do here is get the headers of a given URL so I can determine the mime-type. I want to be able to see if http://somedomain/foo/ will return an html document or a jpg image for example. Thus, I need to figure out how to send a HEAD request so that I can read the mime-type without having to download the content. Does anyone know of an easy way of doing this?

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  • Can I use rest-client to POST a binary file to HTTP without multipart?

    - by Angela
    I have tried to do the following, but the web-service is NOT REST and does not take multi-part. What do I do in order to POST the image? @response = RestClient.post('http://www.postful.com/service/upload', {:upload => { :file => File.new("#{@postalcard.postalimage.path}",'rb') } }, {"Content-Type" => @postalcard.postalimage.content_type, "Content-Length" => @postalcard.postalimage.size, "Authorization" => 'Basic xxxxxx' } # end headers ) #close arguments to Restclient.post

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  • Nginx with http/https - Http seemed redirected to https all the time

    - by dwarfy
    I've this really weird behaviour with my ubuntu 10.04 / nginx 1.2.3 server. Basically I changed the SSL certificates this morning. And ever since it has been behaving weirdly on all apps. Godaddy is reporting that HTTPS/SSL setup is correct. When I try a page it still works correctly when I'm using HTTPS. But when I try using HTTP nginx reports error : 400 Bad Request The plain HTTP request was sent to HTTPS port After looking around on google for hours, I've tried different setup (while originaly my setup was working correctly for longtime, I just renewed certificates) I kindof found a half solution by adding this to my config : error_page 497 $request_uri; The realllly weird thing is that when I use this setup : server { listen 80; server_name john.johnrocks.eu; access_log /home/john/envs/john_prod/nginx_access.log; error_log /home/john/envs/john_prod/nginx_error.log; location / { uwsgi_pass unix:///home/john/envs/john_prod/john.sock; include uwsgi_params; } location /media { alias /home/john/envs/john_prod/johntab/www; } location /adminmedia { alias /home/john/envs/john_prod/johntab/www/adminmedia; } } I still have the same error when using HTTP (while nothing is setup for HTTPS here)?? I'm getting crazy on this !

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  • Disable integrated client certificate validation in IIS7?

    - by danford
    We have an IIS 7 hosted site that requires client certificates (two-way ssl). Unfortunately, I don't have access to the trusted certificate store on the host machines, and so I was forced to write a custom http module to verify the certificates. My module never gets a chance to do the authentication, however, because IIS doesn't recognize the certificates and responds with a 403.7 error. How do I turn off client certificate validation, while still requiring clients to provide them?

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  • some clarification on accept field in http request

    - by Salvador Dali
    Can anyone enlighten me on the following question: What do different fields in accept field in HTTP request mean? I can understand the basics that through accept the client is telling the server what type of information it is waiting to receive, so for example: Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 This way the client will tell the server that it can understand three following formats: text/html application/xhtml+xml application/xml But can someone tell me what this q values mean and that / Also if I have any flaws in my understanding - please tell me.

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  • Intermittent Disconnection of Client Computers from Domain Server

    - by dilip nagle
    The Background: I have Windows 2008 server Enterprise Version with 25 user cal licences. It has a domain and all users and a network shared HP printer in it. The Server has two network cards and both these cards as well as all client machines are on IP addressing scheme of 192.168.1.* with subnetmask 255.255.255.0. Of the two network cards viz. 192.168.1.231 and 192.168.1.233, only 192.168.1.231 is registered with DNS. In 192.168.1.233(i.e. 2nd network card) has default getway as 192.168.1.231 and dns address as 192.168.1.231. The Server has three hard disks with capacities as 500gb, 500gb and 1TB and are partitioned as (C,D,E), (F,G) and (K) with partition K having all user data into various Shared Folders. Each of these folders(On Partition K), are mapped onto each user's computer as per the right of access given to them. The Problem: The Server was installed about 6 months ago and till date not even once, the Server has Hung or has given any problem. All the Clients computers are able to run the web based software from their computers via ip address, e.g. http://192.168.1.231/webERP/default.aspx. However, occassionally, when any client computer tries to browse network mappings, it hangs. Again, there is no fixed pattern. This may happen after running smoothly for say 3 days. On each Client's machine, the network settings are as follows: IP Address: 192.168.1.* where * is 1,2,3 .... Sunnetmask: 255.255.255.0 defauly getway: 192.168.1.231 Which is a server card and DNS address. preferred DNS Server: 192.168.1.231 In Advanced Tab under Wins: LMHostLookup is Unticked and default is radio buttoned. Ideally, I would have loved to have Disabled NETBIOS over TCP/IP but some network printers do not get accessed if this option is enabled(ie. Radio Buttoned). Bacause Disabling Netbios will drastically reduce traffic of NETBIOS broadcasting to all the computers on the net to do naming resolution. On Server, I have WINs Running which I have Scavanged Records, verified Database Integrity etc, removed Tombstoned Records etc. The Critical Errors shown only once a day when the server is statred are 4224(WINS) and 12923 - Server Licencing failed to Update DNS Record. I fail to understand as why do client machines HANG when they try to browse mapped network shared folders on K Drive. Kindly Advice

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  • Run client applications from VMWare Workstation Host.

    - by user40470
    Does anyone know how to run applications hosted on a client VM from an icon created on the host computer. For example I want to run IE8 installed on the client VM on my host XP computer running IE6. I cant update to IE6 on the host because of compliance issues. I'm trying to do this with VMWare Workstation 7. I'll post the solution if I can figure this out before I get your assistance. Thanks!!!

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  • Simple way of converting server side objects into client side using JSON serialization for asp.net websites

    - by anil.kasalanati
     Introduction:- With the growth of Web2.0 and the need for faster user experience the spotlight has shifted onto javascript based applications built using REST pattern or asp.net AJAX Pagerequest manager. And when we are working with javascript wouldn’t it be much better if we could create objects in an OOAD way and easily push it to the client side.  Following are the reasons why you would push the server side objects onto client side -          Easy availability of the complex object. -          Use C# compiler and rick intellisense to create and maintain the objects but use them in the javascript. You could run code analysis etc. -          Reduce the number of calls we make to the server side by loading data on the pageload.   I would like to explain about the 3rd point because that proved to be highly beneficial to me when I was fixing the performance issues of a major website. There could be a scenario where in you be making multiple AJAX based webrequestmanager calls in order to get the same response in a single page. This happens in the case of widget based framework when all the widgets are independent but they need some common information available in the framework to load the data. So instead of making n multiple calls we could load the data needed during pageload. The above picture shows the scenario where in all the widgets need the common information and then call GetData webservice on the server side. Ofcourse the result can be cached on the client side but a better solution would be to avoid the call completely.  In order to do that we need to JSONSerialize the content and send it in the DOM.                                                                                                                                                                                                                                                                                                                                                                                            Example:- I have developed a simple application to demonstrate the idea and I would explaining that in detail here. The class called SimpleClass would be sent as serialized JSON to the client side .   And this inherits from the base class which has the implementation for the GetJSONString method. You can create a single base class and all the object which need to be pushed to the client side can inherit from that class. The important thing to note is that the class should be annotated with DataContract attribute and the methods should have the Data Member attribute. This is needed by the .Net DataContractSerializer and this follows the opt-in mode so if you want to send an attribute to the client side then you need to annotate the DataMember attribute. So if I didn’t want to send the Result I would simple remove the DataMember attribute. This is default WCF/.Net 3.5 stuff but it provides the flexibility of have a fullfledged object on the server side but sending a smaller object to the client side. Sometimes you may hide some values due to security constraints. And thing you will notice is that I have marked the class as Serializable so that it can be stored in the Session and used in webfarm deployment scenarios. Following is the implementation of the base class –  This implements the default DataContractJsonSerializer and for more information or customization refer to following blogs – http://softcero.blogspot.com/2010/03/optimizing-net-json-serializing-and-ii.html http://weblogs.asp.net/gunnarpeipman/archive/2010/12/28/asp-net-serializing-and-deserializing-json-objects.aspx The next part is pretty simple, I just need to inject this object into the aspx page.   And in the aspx markup I have the following line – <script type="text/javascript"> var data =(<%=SimpleClassJSON  %>);   alert(data.ResultText); </script>   This will output the content as JSON into the variable data and this can be any element in the DOM. And you can verify the element by checking data in the Firebug console.    Design Consideration – If you have a lot of javascripts then you need to think about using Script # and you can write javascript in C#. Refer to Nikhil’s blog – http://projects.nikhilk.net/ScriptSharp Ensure that you are taking security into consideration while exposing server side objects on to client side. I have seen application exposing passwords, secret key so it is not a good practice.   The application can be tested using the following url – http://techconsulting.vpscustomer.com/Samples/JsonTest.aspx The source code is available at http://techconsulting.vpscustomer.com/Source/HistoryTest.zip

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  • Xcode 4 and cocos2D 1.0.0 beta Uncategorized errors and Info.plist doesn't exist

    - by badben
    I just installed the xcode 4 sdk and the cocos2d 1.0.0 beta template. I just created a new project with the cocos2d template. But when I build I got these errors : (for information my previous projects developed with xcode 3 have the same problem) warning: couldn't add 'com.apple.XcodeGenerated' tag to '/Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build': Error Domain=NSPOSIXErrorDomain Code=2 UserInfo=0x201dde680 "The operation couldn’t be completed. No such file or directory" error: unable to create '/Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates' (Permission denied) error: unable to create '/Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Products' (Permission denied) Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build/Objects-normal/i386 Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/PrecompiledHeaders/Prefix-dflnzjtztxdgjwhistrvvjxetfrg Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/PrecompiledHeaders/Prefix-fqemzerugrwojibbegzkffljkxqs Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Intermediates/xcode4.build/Debug-iphonesimulator/xcode4.build Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Index/PrecompiledHeaders/Prefix-dbtcglhksokwygezixirqkgfipsr_ast Unable to create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Index/PrecompiledHeaders/Prefix-gdirtpasdqzasnclnkzguimarjpd_ast error: couldn't create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Products/Debug-iphonesimulator/xcode4.app: Permission denied error: couldn't create directory /Users/Benoit/Library/Developer/Xcode/DerivedData/xcode4-bswxazfuwbsguiasyatbtlmvbpps/Build/Products/Debug-iphonesimulator/xcode4.app: Permission denied The file “Info.plist” doesn’t exist. Please help !!

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