Beginner's Walk - Web Development
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Question about server usage, big community platform
- by Json
I’m working on a community platform writen in PHP, MySQL. I have some questions about the server usage maybe someone can help me out. The community is based on JQuery with many ajax requests to update content. It makes 5 - 10 AJAX(Json, GET, POST) requests every 5 seconds, the requests fetch user data like user notifications and messages by doing mySQL queries. I wonder how a server will handle this when there are for more than 5000 users online. Then it will be 50.000 requests every 5 seconds, what kind of server you need to handle this? Or maybe even more, when there are 15.000 users online, 150.000 requests every 5 seconds. My webserver have the following specs. Xeon Quad 2048MB 5000GB traffic Will it be good enough, and for how many users? Anyone can help me out or know where to find such information, like make a calculation?Read the article
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Virtual Private Server Web Hosting Services
There are many reasons why an organization requires a virtual private server. A Virtual Private Server hosting plan can be the solution to all of your needs. The best way to decide would be to access... [Author: John Anthony - Computers and Internet - May 11, 2010]Read the article
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What is the architectural name for the set of data that enables UI choices?
- by Richard Collette
I have separate service methods that fetch business object data and the data for UI selection input such as radio buttons, check-boxes, combo-boxes, etc. I want to name my service methods that fetch the selection data appropriately. I am assuming that Model and ViewModel would not be part of the name because the selection data is but a portion of the Model or ViewModel. What might this set of data be named such that I can name my service method?Read the article
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Run server side script
- by ooo
I'm in the process of deploying my first website which is written is ASP.NET. I need to run a server side script at set intervals during the day which updates a database even if there is nobody using the site. I was led to believe that using Windows task scheduler would be the best option but now I've joined a hosting company the layout is not really how I was expecting. It's a shared hosting with basic FTP and no apparent built in task scheduler. The hosting company support is not very good and haven't been able to advise how I could do this so hoped to get help here on options before I consider changing company. [The hosting company starts with 1 and ends with 1 :)]Read the article
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Would form keys reduce the amount of spam we receive?
- by David Wilkins
I work for a company that has an online store, and we constantly have to deal with a lot of spam product reviews, and bogus customer accounts. These are all created by automated systems and are more of a nuisance than anything. What I am thinking of (in lieu of captcha, which can be broken) is adding a sort of form key solution to all relevant forms. I know for certain some of the spammers are using XRumer, and I know they seldom request a page before sending us the form data (Is this the definition of CSRF?) so I would think that tying a key to each requested form would at least stem the tide. I also know the spammers are lazy and don't check their work, or they would see that we have never posted a spam review, and they have never gained any revenue from our site. Would this succeed in significantly reducing the volume of spam product reviews and customer account creations we are seeing? EDIT: To clarify what I mean by "Form Keys": I am referring to creating a unique identifier (or "key") that will be used as an invisible, static form field. This key will also be stored either in the database (relative to the user session) or in a cookie variable. When the form's target gets a request, the key must be validated for the form's data to be processed. Those pesky bots won't have the key because they don't load the javascript that generates the form (they just send a blind request to the target) and even if they did load the javascript once, they'd only have one valid key, and I'm not sure they even use cookies.Read the article
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Rehosting content from another server
- by Lana_M
We have a set of static pages that will augment a customer's existing site. The pages will not reside on the customer's servers for logistical reasons and because we need to maintain control of the content. The plan is for the customer to set up a mod_rewrite rule that will funnel certain types of URLs to a single server-side handler script that will grab the appropriate file from a CDN and just output its content. This illustrates the approach: <?php echo(file_get_contents(str_replace($customer_host, $cdn_host, $_SERVER['REQUEST_URI']))); ?> Can anyone think of pitfalls or offer up a different approach? Is there some way to circumvent a script altogether?Read the article
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Best way to create an exact twitter clone? From scratch vs CMS vs any other way [closed]
- by Akash
I tried many already built Twitter clone scripts but none was having user-end functionality exactly as twitter. I know enough PHP to code all the twitter's features myself. But is there a faster way than coding myself? I've never used a CMS but if I do then won't I have to search a plugin for every twitter feature, like support for multiple users, options for following-unfollowing users, retweeting (reposting someone else's post), tagging? And I'm afraid that there might be some licensing issues with CMS.Read the article
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Html.ValidationSummary and Multiple Forms
- by MightyZot
Originally posted on: http://geekswithblogs.net/MightyZot/archive/2013/11/11/html.validationsummary-and-multiple-forms.aspxThe Html.ValidationSummary helper writes a div with a list of general errors added to the model state while a request is being serviced. There is generally one form per view or partial view, I think, so often there is only one call to Html.ValidationSummary in the page resulting from the assembly of your views. And, consequently, there is no problem with the markup that Html.ValidationSummary spits out as a result. What if you want to put multiple forms in one view? Even if you create a view model that’s an aggregate of the view models for each form, the error validation summary is going to contain errors from both forms. Check out this screen shot, which shows a page with multiple forms. Notice how the error validation summary shows up twice. Grrr! Errors for the login form also show up in the registration form. Luckily, there is an easy way around this. Pull the errors out of the model state and separate them for each form. You’ll need to identify the appropriate form by setting the key when you make calls to ModelState.AddModelError. Assume in my example that errors for the login form are added to model state using the “LoginForm” key. And, likewise, assume that errors for the registration form are added to model state using the “RegistrationForm” key. An example of that might look like this… // If we got this far, something failed, redisplay form ModelState.AddModelError("LoginForm", "User name or password is not right..."); return View(model); Over in the code for your View, you can pull each form’s errors from the model state using lambda expressions that look like these… var LoginFormErrors = ViewData.ModelState.Where(ms => ms.Key == "LoginForm"); var RegistrationFormErrors = ViewData.ModelState.Where(ms => ms.Key == "RegistrationForm"); Now that you have two collections containing errors, you can display only the errors specific to each form. I’m doing that in my code by removing the calls to Html.ValidationSummary and replacing them with enumerators that look like this… if(LoginFormErrors.Count() > 0) { <div class="cdt-error-list"> <ul> @foreach (var entry in LoginFormErrors) { foreach (var error in entry.Value.Errors) { <li>@error.ErrorMessage</li> } } </ul> </div> } …and for the registration form, the code looks like this… @if(RegistrationFormErrors.Count() > 0) { <div class="cdt-error-list"> <ul> @foreach (var entry in RegistrationFormErrors) { foreach (var error in entry.Value.Errors) { <li>@error.ErrorMessage</li> } } </ul> </div> } The result is a nice clean separation of the list of errors that are specific to each form. And, this is important because each form is submitted separately in my case, so both forms don’t generate errors in the same context. As you’ll see in the screen shot below, errors added to the model state when the login form is submitted do not show up in the registration form’s validation summary.Read the article
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What tools and knowledge do I need to create an application which generates bespoke automated e-mails? [on hold]
- by Seraphina
I'd like some suggestions as to how to best go about creating an application which can generate bespoke automated e-mails- i.e. send a personalized reply to a particular individual, interpreting the context of the message as intelligently as possible... (This is perhaps too big a question to be under one title?) What would be a good starting point? What concepts do I need to know? I'd imagine that the program needs to be able trawl through e-mails as and when they come in, and search for keywords in e-mail content, in order to write an appropriate reply. So there needs to be some form of automated response embedded in the code. Machine learning and databases come to mind here, as I'm aware that google incorporates machine learning already in gmail etc. It is quite tricky to google the above topic, and find the perfect tutorial. But there are some interesting articles and papers out there: Machine Learning in Automated Text Categorization (2002) by Fabrizio Sebastiani , Consiglio Nazionale Delle Ricerche However, this is not exactly a quick start guide. I intend to add to this question, and no doubt other questions will spark off this one. I look forward to suggestions.Read the article
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What should I aware of , when preparing a document of website for later maintenance use?
- by user782104
The development team has finished a website and my duty is to prepare a document so that other programmer can maintain the website with ease . As I am inexperience of that, I would like to ask what should be mentioned (document structure) in that report? So far my idea is only prepare a ERD diagarm for database and flow chart for each function. Any other suggestions, eg. what cookies stored ? ThanksRead the article
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My Sites Were Hacked. What To Do?
- by Vad
I host multiple domains with this very popular hosting provider and I just went into one of my sites and... I see a black page with message "Hacked by...". I checked and all my sites with the provider are showing this same page. Inside of file system I have seen the hacker placed all default.* and index.* files with this message. So the hacker overwrote all index pages, placed new pages and that is under every, I say again, every folder. Cleaning this up will be close to a most horrible job. What to do (right now I am awaiting the restore of files from hosting provider)? How to prevent this? Whom to blame?Read the article
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Dedicated server: managed hosting or manage it myself?
- by ddawber
We're currently hosting a number of sites on a self-managed dedicated server. Some companies, however, offer a managed dedicated server hosting service. They offer: Roughly the same server spec Ticketing system support Managed daily backups Virtual firewall (but with a limit of 10 IP addresses allowed through at any one time) Now, this managed hosting is at extra expense - somewhere in the region of $500 per month, and the limit on the number of IP addresses they'll manage on the firewall is also a real pain. My thinking is it would be better and cheaper to Stay with the same host since the dedicated box is fine Get an Amazon AWS account and use their server to manage backups; there are a number of good tools that can be used to automate the process Configure iptables so that I have complete control of the firewall I want to know Is a managed virtual firewall likely to be more secure than me configuring iptables? Whether, in your opinion, it's best to let someone else take care of backups? If, from your experience, there's anything else i'm missing that warrants using managed hosting over a DIY service? I think there is some reluctance to not having managed hosting since a managed host in effect takes responsibility for your server, whereas any hardware or security issues with a server that we manage would mean we are forced to hold our hands up when a client site goes down. That said, I personally don't think a managed host does that much in the day to day running of your server (backups are automatic, OS updates are carried out with ease, etc.).Read the article
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What is best way to manage all images in a big project, inline images, background images, css sprite images?
- by metal-gear-solid
How do you manage all images in a big project, inline images, background images, css sprite images? Do you follow any naming convention? Do you create sub-folders to manage images? In a big project how to make it easy to find for new people in the development team if any images which they want to use (because it's in new PSD they received from designer) is already available in images folder of project and how they can find it easily.Read the article
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Creating an online community - use templates or self-develop?
- by ican ican
PHPMotion, Joomla or develop my own? I'm thinking of developing a common interest online community. It will be have UGC, stats, etc.. functionality, and perhaps an online store. Though cost is an issue at this time, I want to be professional and effective. Should I use existing free platform templates, like PHP, Joomla, or should I develop my own? What are the advantages/disadvantages of either option? As a rough estimate, how much will it cost me to develop and manage my own? And how long will it take. In general what should I be careful about on this journey?Read the article
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How To Enable Do Not Track In Every Web Browser
- by Chris Hoffman
We’ve covered why “Do Not Track” isn’t a silver bullet that prevents you from being tracked. However, if you don’t like being tracked and want to express that preference to websites, you can enable “Do Not Track” in every browser. To Google’s credit, future versions of Chrome explain exactly what Do Not Track does when you enable it. Remember that, by enabling Do Not Track, you’re just expressing a preference. Websites may or may not obey your preference. Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network InterferenceRead the article
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Abandoment to blame?
- by Larsenal
I have a code snippet for an app that users are loading as a 3rd party script on their site. The general sequence is as follows: Site loads "http://www.example.com/foo.js" foo.js does stuff 1 to 2 seconds later, foo.js loads bar.js Now in a perfect world, I'd want to see matching counts for the calls to foo.js and bar.js. However, bar.js loads only about 94% of the time. I'm wondering how much of this discrepancy might be attributable to site abandonment given the fact that bar.js is delayed by 1 or 2 seconds. I posted here instead of StackOverflow since I think it's more a question about what would be typical time on page when users abandon the page.Read the article
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Schema.org vs microformats
- by Tordek
They both server the same purpose: providing a vocabulary for semantic markup. Schema is recognized and standardized... but microformats are open. Schema exploits microdata, while microformats go on classes. (Of note: microdata means that an element must be of a single itemtype, while microformats allow several classes to apply to the same element. I can markup xFolk+hAtom with classes, but not with microdata.) Is this a black-and-white situation? Google says I can't use both "because it may confuse the parser". What's the consensus on these?Read the article
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Older PHP v/s newer PHP version [closed]
- by Monty
My company is building a website with database. Programmer's used PHP 5.0. My Service Provider (shared) in the meantime upgraded to PHP 5.3.0. Fixes have been on going and seem endless... Do I move to VPS and install older PHP or should we rebuild with newer PHP? When working remotely with programers what is the protocol regarding delivery of all code? Please what is the industry standard? I need an independent to review their work. How should this be approached?Read the article
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hPalm and a web-centric strategy
The acquisition battle has come and gone, and it’s HP that’s become Palm’s new owner. In general this news has been greeted withgladcries,despite (or maybe because) it was so unexpected. In general everybody assumes that the marriage of Palm software and HP hardware will be a good one, and that HP will also release a webOS-based tablet device.However, there’s an interesting dissenting opinion on VisionMobile (a blog I highly recommend, by the way). Guest author Michael Valukenko sees few synergies...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.Read the article
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How to handle monetary values in PHP and MySql?
- by Songo
I've inherited a huge pile of legacy code written in PHP on top of a MySQL database. The thing I noticed is that the application uses doubles for storage and manipulation of data. Now I came across of numerous posts mentioning how double are not suited for monetary operations because of the rounding errors. However, I have yet to come across a complete solution to how monetary values should be handled in PHP code and stored in a MySQL database. Is there a best practice when it comes to handling money specifically in PHP? Things I'm looking for are: How should the data be stored in the database? column type? size? How should the data be handling in normal addition, subtraction. multiplication or division? When should I round the values? How much rounding is acceptable if any? Is there a difference between handling large monetary values and low ones? Note: A VERY simplified sample code of how I might encounter money values in everyday life: $a= $_POST['price_in_dollars']; //-->(ex: 25.06) will be read as a string should it be cast to double? $b= $_POST['discount_rate'];//-->(ex: 0.35) value will always be less than 1 $valueToBeStored= $a * $b; //--> any hint here is welcomed $valueFromDatabase= $row['price']; //--> price column in database could be double, decimal,...etc. $priceToPrint=$valueFromDatabase * 0.25; //again cast needed or not? I hope you use this sample code as a means to bring out more use cases and not to take it literally of course. Bonus Question If I'm to use an ORM such as Doctrine or PROPEL, how different will it be to use money in my code.Read the article
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Using Dynamic LINQ to get a filter for my Web API
- by Espo
We are considering using the Dynamic.CS linq-sample included in the "Samples" directory of visual studio 2008 for our WebAPI project to allow clients to query our data. The interface would be something like this (In addition to the normal GET-methods): public HttpResponseMessage List(string filter = null); The plan is to use the dynamic library to parse the "filter"-variable and then execute the query agains the DB. Any thoughts if this is a good idea? Is it a security problem?Read the article
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Redirect Google crawler to different robots.txt via .htaccess
- by user3474818
I have googled for the answer all day and still couldn't find an answer. I have a virtual subdomain www.static.example.com which is a mirror site of www.example.com. It means I have just one root folder for subdomain and domain aswell. I want to redirect crawlers to different robots.txt file - robots_static.txt when they see .static in url in which I will forbid indexing via /disallow command. I want to do this because I have duplicated content in Google search results. Subdomain is showing the exact same content as the main domain. Does anyone know how could I achieve that crawlers sees robots_static.txt instead of robots.txt? What I have managed to find so far is this: RewriteCond %{HTTP_HOST} ^www.static.*$ [NC] RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*robots\.txt.*\ HTTP/ [NC] RewriteRule ^robots\.txt /robots_static.txt [NC,L] but when I check in webmaster tools, it still sees robots.txt as my robots file instead of robots_static.txt, so it crawls and index everything twice. What did I do wrong? Thanks EDIT: This is my .htaccess file ## # @package Joomla # @copyright Copyright (C) 2005 - 2013 Open Source Matters. All rights reserved. # @license GNU General Public License version 2 or later; see LICENSE.txt ## ## # READ THIS COMPLETELY IF YOU CHOOSE TO USE THIS FILE! # # The line just below this section: 'Options +FollowSymLinks' may cause problems # with some server configurations. It is required for use of mod_rewrite, but may already # be set by your server administrator in a way that dissallows changing it in # your .htaccess file. If using it causes your server to error out, comment it out (add # to # beginning of line), reload your site in your browser and test your sef url's. If they work, # it has been set by your server administrator and you do not need it set here. ## ## Can be commented out if causes errors, see notes above. Options +FollowSymLinks ## Mod_rewrite in use. RewriteEngine On RewriteEngine On RewriteCond %{HTTP_HOST} !^www\. RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L] RewriteCond %{HTTP_HOST} ^www.static.*$ [NC] RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*robots\.txt.*\ HTTP/ [NC] RewriteRule ^robots\.txt /robots_static.txt [NC,L] ## Begin - Rewrite rules to block out some common exploits. # If you experience problems on your site block out the operations listed below # This attempts to block the most common type of exploit `attempts` to Joomla! # # Block out any script trying to base64_encode data within the URL. RewriteCond %{QUERY_STRING} base64_encode[^(]*\([^)]*\) [OR] # Block out any script that includes a <script> tag in URL. RewriteCond %{QUERY_STRING} (<|%3C)([^s]*s)+cript.*(>|%3E) [NC,OR] # Block out any script trying to set a PHP GLOBALS variable via URL. RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR] # Block out any script trying to modify a _REQUEST variable via URL. RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2}) # Return 403 Forbidden header and show the content of the root homepage RewriteRule .* index.php [F] # ## End - Rewrite rules to block out some common exploits. ## Begin - Custom redirects # # If you need to redirect some pages, or set a canonical non-www to # www redirect (or vice versa), place that code here. Ensure those # redirects use the correct RewriteRule syntax and the [R=301,L] flags. # ## End - Custom redirects ## # Uncomment following line if your webserver's URL # is not directly related to physical file paths. # Update Your Joomla! Directory (just / for root). ## # RewriteBase / RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC] RewriteCond %{THE_REQUEST} !/system/.* RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,L] RewriteCond %{THE_REQUEST} ^GET ## Begin - Joomla! core SEF Section. # RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}] # # If the requested path and file is not /index.php and the request # has not already been internally rewritten to the index.php script RewriteCond %{REQUEST_URI} !^/index\.php # and the request is for something within the component folder, # or for the site root, or for an extensionless URL, or the # requested URL ends with one of the listed extensions RewriteCond %{REQUEST_URI} /component/|(/[^.]*|\.(php|html?|feed|pdf|vcf|raw))$ [NC] # and the requested path and file doesn't directly match a physical file RewriteCond %{REQUEST_FILENAME} !-f # and the requested path and file doesn't directly match a physical folder RewriteCond %{REQUEST_FILENAME} !-d # internally rewrite the request to the index.php script RewriteRule .* index.php [L] # ## End - Joomla! core SEF Section. <FilesMatch "\.(ico|pdf|flv|jpg|ttf|jpg|jpeg|png|gif|js|css|swf)$"> Header set Expires "Wed, 15 Apr 2020 20:00:00 GMT" Header set Cache-Control "public" </FilesMatch> <ifModule mod_headers.c> Header set Connection keep-alive </ifModule> ########## Begin - Remove Etags # FileETag none # ########## End - Remove EtagsRead the article
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How to Use the Google Keyword Tool to Pimp Your Web Page
For all the search engines, and maybe especially for Google, topical relevance is everything. The words on your webpage will get ranked for relevance on one or more topics or categories. There are probably 100 or more other factors that go into a Google ranking, most of which we will never know, but the major ranking factor has to be the words on your page and their proximity to each other.Read the article
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Significant number of non-HTTP requests hitting my site
- by Mark Westling
I'm seeing a significant number of non-HTTP requests hitting a site I just launched. They show up in the server (nginx) logs as non-ASCII and get rejected (correctly) with a 400 status. Here are some lines from the log: 95.132.198.189 - - [09/Jan/2011:13:53:30 -0500] "œ$A\x10õœ²É9J" 400 173 "-" "-" 79.100.145.126 - - [09/Jan/2011:13:57:42 -0500] "#§i²¸oYi Ṅ\x13VJ—x·—œ\x04N \x1DÔvbÛè½\x10§¬\x1E0œ_^¼+\x09ÜÅ\x08DÌÃiJeT€¿æ]œr\x1EëîyIÐ/ßýúê5Ǹ" 400 173 "-" "-" 79.100.145.126 - - [09/Jan/2011:13:58:33 -0500] "¯Ú%ø=Œ›D@\x12¼\x1C†ÄÀe\x015mˆàd˜Û%pÛÿ" 400 173 "-" "-" What should I make of this? Is this some sort of scripted attack? Or could these be correct requests that have somehow been garbled? They're not affecting the performance of the site and I'm not seeing any other signs of attacks (e.g., no strange POSTs) so at this point I'm more curious than afraid.Read the article
