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• Why would HTTP transfer via wget be faster than lftp/pget?

  - by jondahl

  I'm building software that needs to do massive amounts of file transfer via both HTTP and FTP. Often times, I get faster HTTP download with a multi-connection download accelerator like axel or lftp with pget. In some cases, I've seen 2x-3x faster file transfer using something like: axel http://example.com/somefile or lftp -e 'pget -n 5 http://example.com/somefile;quit' vs. just using wget: wget http://example.com/somefile But other times, wget is significantly faster than lftp. Strangly, this is even true even when I do lftp with get, like so: lftp -e 'pget -n 1 http://example.com/somefile;quit' I understand that downloading a file via multiple connections won't always result in a speedup, depending on how bandwidth is constrained. But: why would it be slower? Especially when calling lftp/pget with -n 1?

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• AppFabric caching's local cache isnt working for us... What are we doing wrong?

  - by Olly

  We are using appfabric as the 2ndlevel cache for an NHibernate asp.net application comprising a customer facing website and an admin website. They are both connected to the same cache so when admin updates something, the customer facing site is updated. It seems to be working OK - we have a CacheCLuster on a seperate server and all is well but we want to enable localcache to get better performance, however, it dosnt seem to be working. We have enabled it like this... bool UseLocalCache = int LocalCacheObjectCount = int.MaxValue; TimeSpan LocalCacheDefaultTimeout = TimeSpan.FromMinutes(3); DataCacheLocalCacheInvalidationPolicy LocalCacheInvalidationPolicy = DataCacheLocalCacheInvalidationPolicy.TimeoutBased; if (UseLocalCache) { configuration.LocalCacheProperties = new DataCacheLocalCacheProperties( LocalCacheObjectCount, LocalCacheDefaultTimeout, LocalCacheInvalidationPolicy ); // configuration.NotificationProperties = new DataCacheNotificationProperties(500, TimeSpan.FromSeconds(300)); } Initially we tried using a timeout invalidation policy (3mins) and our app felt like it was running faster. HOWEVER, we noticed that if we changed something in the admin site, it was immediatley updated in the live site. As we are using timeouts not notifications, this demonstrates that the local cache isnt being queried (or is, but is always missing). The cache.GetType().Name returns "LocalCache" - so the factory has made a local cache. Running "Get-Cache-Statistics MyCache" in PS on my dev environment (asp.net app running local from vs2008, cache cluster running on a seperate w2k8 machine) show a handful of Request Counts. However, on the Production environment, the Request Count increases dramaticaly. We tried following the method here to se the cache cliebt-server traffic... http://blogs.msdn.com/b/appfabriccat/archive/2010/09/20/appfabric-cache-peeking-into-client-amp-server-wcf-communication.aspx but the log file had nothing but the initial header in it - i.e no loggin either. I cant find anything in SO or Google. Have we done something wrong? Have we got a screwy install of AppFabric - we installed it via WebPlatform Installer - I think? (note: the IIS box running ASp.net isnt in yhe cluster - it is just the client). Any insights greatfully received!

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• Why is PHP discriminating between .php and .abc extensions for caching?

  - by Sam

  There seems to be a problem between how PHP engine handles identical files that differ only in their file extension. Problem: "An If-Modified-Since conditional request returned the full content unchanged." Also, I measured that the .php extension loads much faster than identitcal twin with .xxx extension even though the file contents are identical, and they differ only in their file extension. "HTTP allows clients to make conditional requests to see if a copy that they hold is still valid. Since this response has a Last-Modified header, clients should be able to use an If-Modified-Since request header for validation. RED has done this and found that the resource sends a full response even though it hadn't changed, indicating that it doesn't support Last-Modified validation." homepage ending with .php exact same file, but ending .ast Given: A home.php file is copied as home.xxx and this extension is added to htaccess to recognize it as a PHP file. The .php file listen to the php.ini where freshness is set to 3 hrs, the non .php files have to listen to htaccess where freshness is set to 2 hrs according to: AddType application/x-httpd-php .php .ast .abc .xxx .etc <IfModule mod_headers.c> ExpiresActive On ExpiresDefault M2419200 Header unset ETag FileETag None Header unset Pragma Header set Cache-Control "max-age=2419200" ##### DYNAMIC PAGES <FilesMatch "\\.(ast|php|abc|xxx)$"> ExpiresDefault M7200 Header set Cache-Control "public, max-age=7200" </FilesMatch> </IfModule> So far so good and everything loads, except, the non-php file doesn't cache properly, or it does cache well but doesn't validate well, to be more specific. See images enclosed. Only the non-php file extension causes the error and loads slower. The entire page.php loads faster as somehow all the elements in there then load properly from cache, while the page.abc has the full request returned while it ought to be cached, meaning the entire page is slower. Bottom line: What should be changed, in order eliminate the If-Modified-Since conditional request returning the full content unchanged?

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• SharePoint MOSS - Serve HTTP content on an HTTPS page without Mixed Content Warning?

  - by kcb263

  Our "portal-like" SharePoint site is served using HTTPS/SSL. So a user goes to https://web.company.com and sees content and different Web Parts. So far, no problem. The desire now is to have new Web Parts added that either frame HTTP content (such as Weather Bug) or HTTP RSS feeds. The issue that arises is that by doing this, results in a "Mixed Content" warning in the browser. Has anybody successfully been able to implement such a scenario, or one similar to it? The options we have looked at, unsuccessfully, have been: using Apache Reverse Proxy Server mirror an external site Custom Web Parts

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• wcf http 504: Working on a mystery

  - by James Fleming

  Ok,  So you're here because you've been trying to solve the mystery of why you're getting a 504 error. If you've made it to this lonely corner of the Internet, then the advice you're getting from other bloggers isn't the answer you are after. It wasn't the answer I needed either, so once I did solve my problem, I thought I'd share the answer with you. For starters, if by some miracle, you landed here first you may not already know that the 504 error is NOT coming from IIS or Casini, that response code is coming from Fiddler. HTTP/1.1 504 Fiddler - Receive Failure Content-Type: text/html Connection: close Timestamp: 09:43:05.193 ReadResponse() failed: The server did not return a response for this request.       The take away here is Fiddler won't help you with the diagnosis and any further digging in that direction is a red herring. Assuming you've dug around a bit, you may have arrived at posts which suggest you may be getting the error because you're trying to hump too much data over the wire, and have an urgent need to employ an anti-pattern: due to a special case: http://delphimike.blogspot.com/2010/01/error-504-in-wcfnet-35.html Or perhaps you're experiencing wonky behavior using WCF-CustomIsolated Adapter on Windows Server 2008 64bit environment, in which case the rather fly MVP Dwight Goins' advice is what you need. http://dgoins.wordpress.com/2009/12/18/64bit-wcf-custom-isolated-%E2%80%93-rest-%E2%80%93-%E2%80%9C504%E2%80%9D-response/ For me, none of that was helpful. I could perform a get on a single record  http://localhost:8783/Criterion/Skip(0)/Take(1) but I couldn't get more than one record in my collection as in:  http://localhost:8783/Criterion/Skip(0)/Take(2) I didn't have a big payload, or a large number of objects (as you can see by the size of one record below) - - A-1B f5abd850-ec52-401a-8bac-bcea22c74138 .biological/legal mother This item refers to the supervisor’s evaluation of the caseworker’s ability to involve the biological/legal mother in the permanency planning process. 75d8ecb7-91df-475f-aa17-26367aeb8b21 false true Admin account 2010-01-06T17:58:24.88 1.20 764a2333-f445-4793-b54d-1c3084116daa So while I was able to retrieve one record without a hitch (thus the record above) I wasn't able to return multiple records. I confirmed I could get each record individually, (Skip(1)/Take(1))so it stood to reason the problem wasn't with the data at all, so I suspected a serialization error. The first step to resolving this was to enable WCF Tracing. Instructions on how to set it up are here: http://msdn.microsoft.com/en-us/library/ms733025.aspx. The tracing log led me to the solution. The use of type 'Application.Survey.Model.Criterion' as a get-only collection is not supported with NetDataContractSerializer.  Consider marking the type with the CollectionDataContractAttribute attribute or the SerializableAttribute attribute or adding a setter to the property. So I was wrong (but close!). The problem was a deserializing issue in trying to recreate my read only collection. http://msdn.microsoft.com/en-us/library/aa347850.aspx#Y1455 So looking at my underlying model, I saw I did have a read only collection. Adding a setter was all it took.         public virtual ICollection<string> GoverningResponses         {             get             {                 if (!string.IsNullOrEmpty(GoverningResponse))                 {                     return GoverningResponse.Split(';');                 }                 else                     return null;             }                  } Hope this helps. If it does, post a comment.

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• How can I enable http auth in lighttpd for all directories except one?

  - by Nuri Hodges

  I am trying to authenticate access to everything in webroot (/) except anything that resides in a particular directory (/directory/) and I've tried both of these options to no avail: $HTTP["url"] =~ "^(?!(/directory))" { auth.require = ( "" => ( "method" => "basic", "realm" => "auth to this area", "require" => "user=username" ) ) } $HTTP["url"] != "/directory" { auth.require = ( "" => ( "method" => "basic", "realm" => "auth to this area", "require" => "user=username" ) ) }

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• Fixing Chrome&rsquo;s AJAX Request Caching Bug

  - by Steve Wilkes

  I recently had to make a set of web pages restore their state when the user arrived on them after clicking the browser’s back button. The pages in question had various content loaded in response to user actions, which meant I had to manually get them back into a valid state after the page loaded. I got hold of the page’s data in a JavaScript ViewModel using a JQuery ajax call, then iterated over the properties, filling in the fields as I went. I built in the ability to describe dependencies between inputs to make sure fields were filled in in the correct order and at the correct time, and that all worked nicely. To make sure the browser didn’t cache the AJAX call results I used the JQuery’s cache: false option, and ASP.NET MVC’s OutputCache attribute for good measure. That all worked perfectly… except in Chrome. Chrome insisted on retrieving the data from its cache. cache: false adds a random query string parameter to make the browser think it’s a unique request – it made no difference. I made the AJAX call a POST – it made no difference. Eventually what I had to do was add a random token to the URL (not the query string) and use MVC routing to deliver the request to the correct action. The project had a single Controller for all AJAX requests, so this route: routes.MapRoute( name: "NonCachedAjaxActions", url: "AjaxCalls/{cacheDisablingToken}/{action}", defaults: new { controller = "AjaxCalls" }, constraints: new { cacheDisablingToken = "[0-9]+" }); …and this amendment to the ajax call: function loadPageData(url) { // Insert a timestamp before the URL's action segment: var indexOfFinalUrlSeparator = url.lastIndexOf("/"); var uniqueUrl = url.substring(0, indexOfFinalUrlSeparator) + new Date().getTime() + "/" + url.substring(indexOfFinalUrlSeparator); // Call the now-unique action URL: $.ajax(uniqueUrl, { cache: false, success: completePageDataLoad }); } …did the trick.

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• REST API rule about tunneling

  - by miku

  Just read this in the REST API Rulebook: GET and POST must not be used to tunnel other request methods. Tunneling refers to any abuse of HTTP that masks or misrepresents a message’s intent and undermines the protocol’s transparency. A REST API must not compromise its design by misusing HTTP’s request methods in an effort to accommodate clients with limited HTTP vocabulary. Always make proper use of the HTTP methods as specified by the rules in this section. [highlights by me] But then a lot of frameworks use tunneling to expose REST interfaces via HTML forms, since <form> knows only about GET and POST. My most recent example is a MethodRewriteMiddleware for flask (submitted by the author of the framework): http://flask.pocoo.org/snippets/38/. Any ways to comply to the "Rule" without hacks or add-ons in web frameworks?

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• Does seeding torrents affect the harddisk RAM caching?

  - by satuon

  I've downloaded a lot of torrent files and while I'm seeding them, I've noticed that very often when I start the browser it's slow and the hard disk activity indicator is on. Usually when I start a program it gets cached in RAM and starting it again is very quick, and I have 3 GB of RAM so usually it stays cached nearly forever. But when my torrent client is seeding it seems that after an hour programs that I ran are no longer cached in RAM. I was thinking maybe it's because of the disk reads which the torrent client performs are cached and fill up RAM eventually. But I don't think they need to be, as they are read only once and are unlikely to be read again soon. So my questions are - is this the way I think, and if so is it possible in principle to prevent the disk reads from being cached? I can try to edit the source code of the program.

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• Oracle Communications Service Broker is now available at http://edelivery.oracle.com/EPD/Download/ge

  - by francois.deza

  Oracle Communications Service Broker is now available at http://edelivery.oracle.com/EPD/Download/get_form?egroup_aru_number=12359008 and documented at http://edelivery.oracle.com/EPD/Download/get_form?egroup_aru_number=12359013 See also white paper "Transforming Service Delivery with Oracle Service Brokering" at http://www.oracle.com/us/products/servers-storage/servers/netra-carrier-grade/060194.pdf

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• The Silverlightning Talks

  - by Brian Genisio's House Of Bilz

  Tomorrow, I will be speaking in Grand Rapids at the Silverlight Firestarter.  It is a one day event intended to get people bootstrapped with Silverlight.  I will be giving the “Advanced Topics” presentation.  I have decided to run it as a series of “Lightning Talks”.  The idea is to give a lot of breadth so you know that the topic exists and move quickly between them.  To go along with the talks, here are a bunch of links that you might find useful: MVVM http://msdn.microsoft.com/en-us/magazine/dd458800.aspx http://msdn.microsoft.com/en-us/magazine/dd419663.aspx http://channel9.msdn.com/shows/Continuum/MVVM/ http://karlshifflett.wordpress.com/2008/11/08/learning-wpf-m-v-vm/ http://johnpapa.net/silverlight/5-minute-overview-of-mvvm-in-silverlight/ Good MVVM Frameworks http://www.galasoft.ch/mvvm/getstarted/ http://caliburn.codeplex.com/Wikipage   Prism http://compositewpf.codeplex.com/ http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2009/10/27/prism-and-silverlight-screencasts-on-channel-9.aspx http://www.grumpydev.com/2009/07/04/why-shouldn%E2%80%99t-i-use-prism/   Unit Testing Silverlight Unit Testing Framework http://code.msdn.microsoft.com/silverlightut http://silverlight.codeplex.com/ http://www.jeff.wilcox.name/2008/03/silverlight2-unit-testing/ NUnit Testing with Silverlight http://weblogs.asp.net/nunitaddin/archive/2008/05/01/silverlight-nunit-projects.aspx Useful Testing Tools http://testdriven.net/ http://nunit.org/ http://code.google.com/p/moq/ http://www.ayende.com/projects/rhino-mocks.aspx   Navigation Framework http://www.silverlightshow.net/items/The-Silverlight-3-Navigation-Framework.aspx http://www.silverlight.net/learn/videos/silverlight-videos/navigation-framework/   Farseer Physics Engine http://farseerphysics.codeplex.com/Wikipage http://physicshelper.codeplex.com/Wikipage http://www.andybeaulieu.com/Home/tabid/67/Default.aspx   Windows Phone 7 http://www.silverlight.net/getstarted/devices/windows-phone/ http://msdn.microsoft.com/en-us/library/ff402535%28VS.92%29.aspx

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• JS and CSS caching issue: possibly .htaccess related

  - by adamturtle

  I've been using the HTML5 Boilerplate for some web projects for a while now and have noticed the following issue cropping up on some sites. My CSS and JS files, when loaded by the browser, are being renamed to things like: ce.52b8fd529e8142bdb6c4f9e7f55aaec0.modernizr-1,o7,omin,l.js …in the case of modernizr-1.7.min.js The pattern always seems to add ce. or cc. in front of the filename. I'm not sure what's causing this, and it's frustrating since when I make updates to those files, the same old cached file is being loaded. I have to explicitly call modernizr-1.7.min.js?v=2 or something similar to get it to re-cache. I'd like to scrap it altogether but it still happens even when .htaccess is empty. Any ideas? Is anyone else experiencing this issue?

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• What is the best windows tool to capture HTTP traffic?

  - by Omar Shahine

  When you want to capture browser traffic or general windows HTTP traffic what tool do you use?

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• Caching of toolbar names in ArcMap

  - by Marko Apfel

  For little GUI-changes in own ArcMap-customizations normally it is enough to start the application and look that every entry is visible. Especially for refactoring of an own toolbar it was still enough to verify that the toolbar is already shown in the choice-list. But this is a fallacy: the entries there comes from a cache. You could verify this by dumping informations in the toolbar constructor. The constructor is only called if the toolbar is activated! Otherwise you see the toolbar name, but this name comes out of a cache. The cache is stored in the registry under: HKCU\Software\ESRI\ArcMap\Settings\CommandBarNameCache

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• Building Custom HTTP Help Pages with WCF

  - by Jesse Ezell

  Been asked this a few times and needed to figure it out myself, so I put together a post on how to host custom HTTP help pages for your WCF services: http://blog.iserviceoriented.com/index.php/2010/05/04/building-custom-http-help-pages-with-wcf/ A little help from the WCF team to open up some of the internal classes would make it more straightforward... until them, it takes a bit of hacking and black magic.

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• Apache on Win32: Slow Transfers of single, static files in HTTP, fast in HTTPS

  - by Michael Lackner

  I have a weird problem with Apache 2.2.15 on Windows 2000 Server SP4. Basically, I am trying to serve larger static files, images, videos etc. The download seems to be capped at around 550kB/s even over 100Mbit LAN. I tried other protocols (FTP/FTPS/FTP+ES/SCP/SMB), and they are all in the multi-megabyte range. The strangest thing is that, when using Apache with HTTPS instead of HTTP, it serves very fast, around 2.7MByte/s! I also tried the AnalogX SimpleWWW server just to test the plain HTTP speed of it, and it gave me a healthy 3.3Mbyte/s. I am at a total loss here. I searched the web, and tried to change the following Apache configuration directives in httpd.conf, one at a time, mostly to no avail at all: SendBufferSize 1048576 #(tried multiples of that too, up to 100Mbytes) EnableSendfile Off #(minor performance boost) EnableMMAP Off Win32DisableAcceptEx HostnameLookups Off #(default) I also tried to tune the following registry parameters, setting their values to 4194304 in decimal (they are REG_DWORD), and rebooting afterwards: HKLM\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultReceiveWindow HKLM\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultSendWindow Additionally, I tried to install mod_bw, which sets the event timer precision to 1ms, and allows for bandwidth throttling. According to some people it boosts static file serving performance when set to unlimited bandwidth for everybody. Unfortunately, it did nothing for me. So: AnalogX HTTP: 3300kB/s Gene6 FTPD, plain: 3500kB/s Gene6 FTPD, Implicit and Explicit SSL, AES256 Cipher: 1800-2000kB/s freeSSHD: 1100kB/s SMB shared folder: about 3000kB/s Apache HTTP, plain: 550kB/s Apache HTTPS: 2700kB/s Clients that were used in the bandwidth testing: Internet Explorer 8 (HTTP, HTTPS) Firefox 8 (HTTP, HTTPS) Chrome 13 (HTTP, HTTPS) Opera 11.60 (HTTP, HTTPS) wget under CygWin (HTTP, HTTPS) FileZilla (FTP, FTPS, FTP+ES, SFTP) Windows Explorer (SMB) Generally, transfer speeds are not too high, but that's because the server machine is an old quad Pentium Pro 200MHz machine with 2GB RAM. However, I would like Apache to serve at at least 2Mbyte/s instead of 550kB/s, and that already works with HTTPS easily, so I fail to see why plain HTTP is so crippled. I am using a Kerio Winroute Firewall, but no Throttling and no special filters peeking into HTTP traffic, just the plain Firewall functionality for blocking/allowing connections. The Apache error.log (Loglevel info) shows no warnings, no errors. Also nothing strange to be seen in access.log. I have already stripped down my httpd.conf to the bare minimum just to make sure nothing is interfering, but that didn't help either. If you have any idea, help would be greatly appreciated, since I am totally out of ideas! Thanks! Edit: I have now tried a newer Apache 2.2.21 to see if it makes any difference. However, the behaviour is exactly the same. Edit 2: KM01 has requested a sniff on the HTTP headers, so here comes the LiveHTTPHeaders output (an extension to Firefox). The Output is generated on downloading a single file called "elephantsdream_source.264", which is an H.264/AVC elementary video stream under an Open Source license. I have taken the freedom to edit the URL, removing folders and changing the actual servers domain name to www.mydomain.com. Here it is: LiveHTTPHeaders, Plain HTTP: http://www.mydomain.com/elephantsdream_source.264 GET /elephantsdream_source.264 HTTP/1.1 Host: www.mydomain.com User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive HTTP/1.1 200 OK Date: Wed, 21 Dec 2011 20:55:16 GMT Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/0.9.8r PHP/5.2.17 Last-Modified: Thu, 28 Oct 2010 20:20:09 GMT Etag: "c000000013fa5-29cf10e9-493b311889d3c" Accept-Ranges: bytes Content-Length: 701436137 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/plain LiveHTTPHeaders, HTTPS: https://www.mydomain.com/elephantsdream_source.264 GET /elephantsdream_source.264 HTTP/1.1 Host: www.mydomain.com User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive HTTP/1.1 200 OK Date: Wed, 21 Dec 2011 20:56:57 GMT Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/0.9.8r PHP/5.2.17 Last-Modified: Thu, 28 Oct 2010 20:20:09 GMT Etag: "c000000013fa5-29cf10e9-493b311889d3c" Accept-Ranges: bytes Content-Length: 701436137 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/plain

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• Modularity through HTTP

  - by Michael Williamson

  As programmers, we strive for modularity in the code we write. We hope that splitting the problem up makes it easier to solve, and allows us to reuse parts of our code in other applications. Object-orientation is the most obvious of many attempts to get us closer to this ideal, and yet one of the most successful approaches is almost accidental: the web. Programming languages provide us with functions and classes, and plenty of other ways to modularize our code. This allows us to take our large problem, split it into small parts, and solve those small parts without having to worry about the whole. It also makes it easier to reason about our code. So far, so good, but now that we’ve written our small, independent module, for example to send out e-mails to my customers, we’d like to reuse it in another application. By creating DLLs, JARs or our platform’s package container of choice, we can do just that – provided our new application is on the same platform. Want to use a Java library from C#? Well, good luck – it might be possible, but it’s not going to be smooth sailing. Even if a library exists, it doesn’t mean that using it going to be a pleasant experience. Say I want to use Java to write out an XML document to an output stream. You’d imagine this would be a simple one-liner. You’d be wrong: import org.w3c.dom.*; import java.io.*; import javax.xml.transform.*; import javax.xml.transform.dom.*; import javax.xml.transform.stream.*; private static final void writeDoc(Document doc, OutputStream out) throws IOException { try { Transformer t = TransformerFactory.newInstance().newTransformer(); t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, doc.getDoctype().getSystemId()); t.transform(new DOMSource(doc), new StreamResult(out)); } catch (TransformerException e) { throw new AssertionError(e); // Can't happen! } } Most of the time, there is a good chance somebody else has written the code before, but if nobody can understand the interface to that code, nobody’s going to use it. The result is that most of the code we write is just a variation on a theme. Despite our best efforts, we’ve fallen a little short of our ideal, but the web brings us closer. If we want to send e-mails to our customers, we could write an e-mail-sending library. More likely, we’d use an existing one for our language. Even then, we probably wouldn’t have niceties like A/B testing or DKIM signing. Alternatively, we could just fire some HTTP requests at MailChimp, and get a whole slew of features without getting anywhere near the code that implements them. The web is inherently language agnostic. So long as your language can send and receive text over HTTP, and probably parse some JSON, you’re about as well equipped as anybody. Instead of building libraries for a specific language, we can build a service that almost every language can reuse. The text-based nature of HTTP also helps to limit the complexity of the API. As SOAP will attest, you can still make a horrible mess using HTTP, but at least it is an obvious horrible mess. Complex data structures are tedious to marshal to and from text, providing a strong incentive to keep things simple. By contrast, spotting the complexities in a class hierarchy is often not as easy. HTTP doesn’t solve every problem. It probably isn’t such a good idea to use it inside an inner loop that’s executed thousands of times per second. What’s more, the HTTP approach might introduce some new problems. We often need to add a thin shim to each application that we wish to communicate over HTTP. For instance, we might need to write a small plugin in PHP if we want to integrate WordPress into our system. Suddenly, instead of a system written in one language, we’re maintaining a system with several distinct languages and platforms. Even then, we should strive to avoid re-implementing the same old thing. As programmers, we consistently underestimate both the cost of building a system and the ongoing maintenance. If we allow ourselves to integrate existing applications, even if they’re in unfamiliar languages, we save ourselves those development and maintenance costs, as well as being able to pick the best solution for our problem. Thanks to the web, HTTP is often the easiest way to get there.

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• Hiding a HTTP Auth-Realm by sending 404 to non-known IPs?

  - by zhenech

  I have an Apache (2.2) serving a web-app on example.com. That web-app has a debug-page reachable via example.com/debug. /debug is currently protected with a HTTP basic auth. As there is only a very small user-base who has access to the debug-page, I would like to hide it based on IP address and return 404 to clients not accessing from our VPN. Serving a 404 based on IP-address only is easy and is described in http://serverfault.com/a/13071. But as soon I add authentication, the users see a 401 instead of a 404. Basically, what I need is: if ($REMOTE_ADDR ~ 10.11.12.*): do_basic_auth (aka return 401) else: return 404

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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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• SharePoint MOSS - Serve HTTP content on an HTTPS page without Mixed Content Warning?

  - by kcb263

  Our "portal-like" SharePoint site is served using HTTPS/SSL. So a user goes to https://web.company.com and sees content and different Web Parts. So far, no problem. The desire now is to have new Web Parts added that either frame HTTP content (such as Weather Bug) or HTTP RSS feeds. The issue that arises is that by doing this, results in a "Mixed Content" warning in the browser. Has anybody successfully been able to implement such a scenario, or one similar to it? The options we have looked at, unsuccessfully, have been: using Apache Reverse Proxy Server mirror an external site Custom Web Parts

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• Are there other application layer firewalls like Microfot TMG (ISA) that do advanced http rules?

  - by Bret Fisher

  Since the old days ISA and now TMG have had several great features that I often want to deploy to my customers because of the enhanced functionality and security, but often the cost of an additinal server HW, Windows Server, and TMG license is too much to justify when compaired to a $300-500 appliance. Are there other gateway firewalls that can perform one or more of these application layer features: pre-auth incoming http traffic against AD/LDAP before sending packets to internal server (forms auth or basic creds popup)? read host headers of incoming http traffic (even on https) to a single public IP and route packets to different internal servers based on that host header?

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• Free web "caching" services for a web service

  - by Jason Banico

  I have a web service on Google App engine whose data is updated on a daily basis. To minimize bandwidth utilization from mobile clients connecting to it, I'd like to instead have an intermediary site where the clients will be getting their data from, and minimizing hits to my service to once or twice a day only. Is there such a service I can use? I'd like to explore this "pull" option first, before considering "push" options such as publishing to a blog site or a free website host that doesn't have bandwidth caps.

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• Simple HTTP server that will send the same file for all requests?

  - by Rory McCann

  I need to debug a XML-RPC application, which sends XML replies over HTTP. I have a sample XML reply (i.e. data from the server, sent to the client that isn't working), I'd like to debug my application. Ideally I'd like a simple HTTP server that will serve one file in reply to all requests. Someone requests /? Send them this file. Someone makes a post to /server/page.php with a certain cookie? Just send them this file. I don't care about multithreading, or security. I will only need to use this for a few hours to debug. I have root on the machine. i.e. I'm hoping there's something as easy to use as this: simple_http_server -p 12445 -f my_test_file I'm aware of python's SimpleHTTPServer module, but I'm not sure how to make it work in this case.

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• WinForms WebBrowser + HTTP Server

  A tiny HTTP server wrapped in a WebBrowser control

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• How do I capture and playback http web requests against multiple web servers?

  - by KevM

  My overall goal is to not interrupt a production system while capturing HTTP Posts to a web application so that I can reverse engineer the telemetry coming from a closed application. I have control over the transmitter of the HTTP Posts but not the receiving web application. It seems like I need a request "forking" proxy. Sort of a reverse proxy that pushes the request to 2 endpoints, a master and slave, only relaying the response from the master endpoint back to the requester. I am not a server geek so something like this may exist but I don't know the term of art for what I am looking for. Another possibility could be a simple logging proxy. Capture a log of the web requests. Rewrite the log to target my "slave" web application. Playback the log with curl or something. Thank you for your assistance.

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