HTTP Handler Method For Images
Jul 10, 2010
I am new to this topic. SO please look over my stupid mistakes. I have web application and its virtual directory path is as followshtpp://localhost/TxtXmlImggHandler/This root has three pages one for text, one for xml, one for images. Actually these pages call three different handlers. I had no problem when I send/receive some data to HTTPHandler for processing, had no problem when I request xml file from HTTPHandler.Now I am trying to get image from HTTPHandler, but no luck. All my HTTPHandlers are sitting in root of my web application
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Similar Messages:
Jan 5, 2011
Basically I have a web site that renders HTML preview of some documents (mainly office). The resulting HTML fragment is included in the page returned by the same web site, however images are returned by HTTP handler from another site with the following links:
<img width="50" height="50" src="http://portal/Service/GetFile.asxh?id=123&inline=true">
For some reason all browsers except Chrome (e.g. IE6/7/8, Firefox, Opera, Safari) show everything just fine, however for these images Chrome shows "broken image" icon. If I choose "Open image in new tab" then the image is shown just fine.
Edit I thought I have solved this issue, but apparently with Fiddler turned on it works fine.
I had context.Response="utf-8" left in code, but removing it had no difference.
Headers:
HTTP/1.1 200 OK
Date: Wed, 05 Jan 2011 14:26:57 GMT
Server: Microsoft-IIS/6.0
MicrosoftOfficeWebServer: 5.0_Pub
[Code]....
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Dec 1, 2010
I'm using Microsoft's PivotViewer control in one of my Silverlight projects. I'm creating a JIT collection and was hoping to dynamically generate the images based on the rendered result of a WPF UserControl. In order to generate the images I'm using an HTTP Handler to serve the images up dynamically.
how I might best go about this. It's all quite a mashup of technologies and a bit difficult to know where best to begin.
EDIT: I have found a guy that's done this in ASP.Net MVC here -
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Jan 24, 2011
I create custom HTTP handler for auto generating file and I want to tell IIS7 to serve current request like normal static file because I need to use IIS and web.config file to control compression setting and any other HTTP header of current requested file.I know. there is an internal class called StaticFileHandler in ASP.net. But I cannot access it. Or you have any other way to work like this.
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Jul 15, 2010
i redirect a page from http to https using http module begin request handler .i am calling webservice using ajax but it is saying webserice not defined .which otherwise works fineits work fine when rediect page in page_load instead .but i need to add function for https to http in every page. i still not know why ajax is not working when i use http module for redirect
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Jan 4, 2011
Background:
We are using the Facebook API and receive back URLs for profile image thumbnails. Unfortunately the protocol is restricted to just HTTP and it doesn't support HTTPS. The page on our site that hosts the thumbnails is always delivered via HTTPS, and if we use HTTP for the thumbnails the user will receive security warnings from their browser.
Solution:
Build an HTTP Handler that "passes through" the image from the Facebook URL, but allow the handler to be called via HTTPS. Before I started coding I thought I could something like this:
Response.OutputStream = WebRequest.Create(FacebookUrlForThumbnail)
but I ended up having to save the image to an object in memory than write the image to the Response.OutputStream using the image save function.
Current Code:
[Code]....
This seems inefficient but I can't find a way of using the HTTP Handler as I orginally intended. Is there way of accomplishing the goal without creating the image memory and just "passing through" the call?
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Jan 20, 2010
clear my concept What is HTTP module and HTTP Handler and how does they work while page requesting???
How authentication and Authorization process work in asp.net?
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Mar 24, 2011
I'm trying to write an HTTP GET handler. The path should start with http://site/processTask and have a set of URL-encoded parameters. I have the following in my web.config
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
<add verb="GET" path="processTask*" type="MyHandler.ProcessTaskHandler, MyHandler"/>
</httpHandlers>
now when I type the URL http://mysite/processTask in browser I get HTTP 404 but if I change the add verb line to the following one:
<add verb="GET" path="processTask.asmx*" type="MyHandler.ProcessTaskHandler, MyHandler"/>
and type http://mysite/ProcessTask.asmx in browser the handler is run and I get the response from the handler. What's the problem? Why is the handler run only when the path contains .asmx? How do I change web.config so that .asmx is not required?
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Nov 24, 2010
Here's what I want to do:
I've created a class library project
and this has a class implementing
the IHttpHandler interface. Let's
call this class ZipHandler. Let's
say the namespace is Zip.
I want that whenever any Http
request comes for a zip file, my
ZipHandler should handle it,
regardless of whether the request is
to an Asp.Net application or a
normal virtual directory.
Queries:
Is it possible (it should be given
the hype about integrated pipeline
etc. in IIS 7)?
How to do it?
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Jan 30, 2010
I successfully added and configured HttpHandler in an Asp.Net WebApplication, but facing problems while trying to add same HttpHandler to Asp.Net WebSite. I have registered it in the web.config, am i missing something This is the error I am getting Configuration Error
Description:
An error occurred during the processing of a configuration file required to service this request.
Parser Error Message: Could not load type 'MyHandler'.
Line 98: </pages>
Line 99: <httpHandlers>
Line 100: <add verb="*" path="*.result" type="MyHandler"/>
Line 101: <remove verb="*" path="*.asmx"/>
Here is handler
public class MyHandler: IHttpHandler
{
#region IHttpHandler Members
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
}
#endregion
}
NOTE: I have not made any request for the handler via url, it is just not letting me run application.
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Nov 25, 2010
I have an VS2010 ASP.NET 4 web site app, to which I added the new Chart control.
When I deployed it to our web server, we get a" Internal Server Error 500." message.
I noticed that the following lines were added to the web.config since the last release, related to the chart control:
<system.web>
<httpHandlers>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
If I remove this added code from the web.config, the site works--Except for the charting functionality.
How do I get the site and the chart page to work?
This is not an issue on IIS versions < 7.
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Feb 11, 2010
In my MSSQL Server I have a table named Nomogram including an attribute named Img1 which include an image of type varbinary(MAX)I wish to load that image on my webform using an http-handler (ashx).How do I do that? I have looked at this sample but I can figure it out how to solve my exact problem. [URL]
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Aug 11, 2010
Scenario: I have a bunch of web applications for which I want to add a simple ping functionality via http handler. Example: [URL]
Problem: For some of the applications this approach does not work becasue of custom HttpModule. These modules have some depedency on either authentication or some other processing logic due to which it makes the request invalid.
I am trying to find a solution to get this ping functionality work without making any changes to existing HttpModules.
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Jun 8, 2010
I'm using output caching in my custom HTTP handler in the following way:
public void ProcessRequest(HttpContext context)
{
TimeSpan freshness = new TimeSpan(0, 0, 0, 60);
context.Response.Cache.SetExpires(DateTime.Now.Add(freshness));
context.Response.Cache.SetMaxAge(freshness);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetValidUntilExpires(true);
...
}
It works, but the problem is that refreshing the page with F5 leads to page regeneration (instead of cache usage) despite of the last codeline:
context.Response.Cache.SetValidUntilExpires(true);
UPD: Seems like the cause of problem is that HTTP handler response isn't caching on server. The following code works well for web-form, but not for handler:
Response.Cache.SetCacheability(HttpCacheability.Server);
Are there some specifics of the caching the http handler response on server?
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Aug 17, 2010
I want to use HTTP Handler in order to create a RSS feeds. For the purpose, I want to put my logic for creating the rss XML in C# class, which implement IHttpHandler, then to "map" this handler into the web.config file and to register the "mapped name" in my routing rules. I am doing something like this:
public class RSSFeedHandler:IHttpHandler
{
public void ProcessRequest( HttpContext context )
{
[code]...
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Mar 15, 2010
I have the next problem: I need to process only 1 request at a time from each user. Lets assume that server identifies each user be UserID, sent in query string.cHow can make the server work the way like FIFO (do not start processing next request until the previous is fully processed)? Should I use the named mutexes inside HTTP handler and assign the name to mutex by UserID?
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Nov 14, 2010
i have an ASP.NET 4.0 HTTP handler that should receive and send data in json format. I'm using jquery to send json objects serialized in a string to the handler. It correctly sends the request but i don't know how i could retrieve the data from the httpcontext passed to the handler and how i could deserialize it..
UPDATE 1
$.ajax({
type: "POST",
url: "myurl.ashx",
dataType: "json",
contentType: "application/json; charset=utf-8",
data: $.toJSON({
...
}),
success: function (response) {
...
}
});
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Jan 2, 2011
I'm just reading about implementing my own HTTP handler for ASP.NET 4.0 and IIS7. This looks really cool. I want special processing for ZIP files and it seems like an HTTP handler is the perfect solution.However, what's giving me trouble is that the handler must be in a separate assembly. So how can I access the rest of my application from this assembly?Specifically, I'd like to determine if the user is authenticated and redirect them to the login page if they are not. But User.Identity.IsAuthenticated, etc. will not be available from my handler.(Yes, I know there are ways to approach this without an HTTP handler but they don't seem appropriate for my specific needs.)
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Sep 17, 2010
Is it possible to determine the HTTP protocol version (e.g. 1.0 vs. 1.1) used for a request within a .ashx handler? I can see all of the header information except for the version in Request.Params.
If not, what avenues are available to discover the HTTP protocol version when processing an HTTP request in ASP.Net?
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Mar 11, 2010
Is it possible to cache the response of a http handler on the server and on the client?This doesn't seem to be doing the trick:
_context.Response.Cache.SetCacheability(HttpCacheability.Public);
_context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
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Mar 25, 2011
We are providing downloads of our application setups through an ASHX handler in ASP.NET.
A customer told us he uses some third party download manager application and that our way of providing the files currently does not support the "resume" feature of his download manager application.
My questions are:
What are the basic behind resuming a download? Is there a certain HTTP GET request that tells me the offset to start at?
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Nov 30, 2010
I use http handler for loading images.
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Jan 15, 2010
This is really weird I am really stuck on this issue. Now the Environment is WIN2K3 Server is my web server Database is SQL 2008 is in the domain itself I have deployed the application which was using the SSO from the parent Share Point Site and was having forms authentication Now the Users to access the application can be outside domain /inside domain so we have logic to get the internal employee or external But the Problem starts when we have got the request to have the application ready for Internal Users like a Intranet application and we need to have the windows authetication in place Now the problem was with WINDOWS authentication I am not able to get to the HTTP Handlers I have in my code thats really wierd as all was working well having the forms auth. I have changed the following things to make it windows auth. Changed the AUthentication in WEB.Config Unchecked the Anynomous user from Directory Security in IIS.
My Problem is ALL application works well except when I tried to call http_handler It is giving me 404 0 2 in IIS logs page not found when I tried to say window.location = "myhandler.myextension?id=285dc559-8293-44f3-a018-4e7024c82e5b" Gives me Page not found error.
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Jul 7, 2010
Just looking for a bit of advice really my colleage suggested using a http handler .ashx file to handle the ajax calls that I will be getting on a web app via a jquery plug in on the page.What i have previously done is write a page _ControlName.aspx which looks at the url an takes or supplies what it needs in json format.What is the better way to handle ajax?
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Mar 30, 2010
I have a new virtual server, subsite. but I get the feeling I may be still be inherting from the root config! Even though I have included <clear/> within both the <connectionString> and <httpModules>.
The main website works (web1) along with one of the subsites (web2) however the 3rd subsite (web3) gives the below error.
e.g.
http://web1
http://web1/web2
http://web1/web3
Gives the following error :
No http handler was found for request type 'GET'
Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: No http handler was found for request type 'GET'
Source Error:
[Code]....
Stack Trace:
[Code]....
Version Information: Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.3082
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