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What are httphandlers and httpmodules?

Posted By:      Posted Date: September 09, 2010    Points: 0   Category :ASP.Net
 
Hi,Can anybody please tell me in very simple language what httphandlers and httpmodules are.


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HttpHandlers and HttpModules in ASP.NET

  
In order to understand the concept of HttpHandlers and HttpModules in ASP.NET, we must need to understand first, how our web server and ASP.NET collectively reacts when a user requests for a particular resource?

Unrecognized configuration section httpHandlers.

  
I spliced this from the webconfig of the working program into another application's webconfig. 
I have just this one error here. Is it ok to have different locations with different system.web areas
 
<?xml version="1.0"?>
			<system.web>
		<!--Start settings for FreeTextBox-->
		<httpHandlers>
			<add verb="GET" path="FtbWebResource.axd" type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox"/>
		</httpHandlers>
		<!--End settings for FreeTextBox-->
		<compilation debug="true" strict="false" explicit="true">
			<assemblies>
				<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				<add assembly="MySql.Data, Version=1.0.7.30072, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
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config.web httpHandlers add and remove elements for ajax

  

I'm using an autocomplete contol of ajax toolkit. Yesterday a user found that it had stopped working (it wasn't generating the list as you type letters in the textbox). After hours of troubleshooting, I found that in web.config <httpHandlers>, this line -- <remove verb="*" path="*.asmx" /> was placed after the <add> line like this:

<httpHandlers>
<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"/>
<remove verb="*" path="*.asmx"/>
</httpHandlers>

I fixed the problem by removing the <remove> line, but it seems I can also fix the problem by placing the <remove> line b

ajax setting in web.config httpHandlers

  

 I'm using an autocomplete contol of ajax toolkit. Yesterday a user found that it had stopped working (it wasn't generating the list as you type letters in the textbox). After hours of troubleshooting, I found that in web.config <httpHandlers>, this line -- <remove verb="*" path="*.asmx" /> was placed after the <add> line like this:

<httpHandlers>
    <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"/>
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    <remove verb="*" path="*.asmx"/>
</httpHandlers>

I fixed the problem by removing the <remove> line, but it seem

httpModules - Remove / Clear From Sub Application

  
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Registering HttpHandlers

  



Hi,

So I found this httphandler online. That I used on my code. Just made some changes to it http://www.dotnetcurry.com/ShowArticle.aspx?ID=214.

My question is my httphandler works fine on the localhost without even adding anything to the web.config file. But it doesnt work when I deployed the website? I am using iss7. Do I have to register this to the web.config file to make it work? if so how. Since this is my first handler. Also how would I install/map it to iis7.

Also I would have to create a .dll file to do it but I am not sure if i just compile the .ashx file it will just make it into a .dll file.


Thank you very much

Guru


How we register httpmodules and httphandler

  

Say I am implementing a HttpModule called my_httpmodule and the class is in \App_Code\myModules folder, do I need to change anything in web.config?


HTTPModules in MOSS 2007

  

i want to update a custom list item in http module but at Item.Update() fuction call it throws the exception "Operation is not valid due to current state of object".

i have made the web.AllowUnSafeUpdate=true

and i am calling the update fuction outside the SPSecurity.RunwitelevatedPrivlage block.

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Web.Config (Tag ) help

  

Can any one help with protecting files and sub-folder?
I have a window web hosting with framework 2.0/3.5 laid-out as follow

/root = www.mydomain.com 

this has its own web.config

sub-folders
/css
/images
/jscripts

Second Domain running off a sub-folder
Note: the second domain is totally different than the master running off the root

/root/Application1/ = www.myseconddomain.com

second domain web.config -> contains

<httpHandlers>
      <add verb="*" path="*.mdb" type="System.Web.HttpForbiddenHandler" />
      <add verb="*" path="*.css" type="System.Web.HttpForbiddenHandler" />
      <add verb="*" path="*.js" type="System.Web.HttpForbiddenHandler" />
      <add verb="*" path="*.swf" type="System.Web.HttpForbiddenHandler" />
      <add verb="*" path="*.jpg" type="System.Web.HttpForbiddenHandler" />
      <add verb="*" path="*.gif" typ

Naming HttpModules

  

Hello Everyone and thanks for you help in advance.  I am writing an HttpModule that is enclosed with a web project, but am having problems accessing it, most likely because of naming issues.

Here is what I have:

A class named RewriteModule.vb that has the following code:

Namespace RewriteModule
    Class RewriteModule
        Implements IHttpModule

 

The project name is RewriteModuleVB

in the web.config file, I have the following:

<httpModules>
 <add name="RewriteModuleVB" type="RewriteModuleVB.RewriteModule, RewriteModuleVB"/>
</httpModules>

I am receiving a configuration error message when I run the page.  Any help would be greatly appreciated.

 

 


Upload Files using httphandlers

  

Hi All,

I want to upload image, user needs to pass username & password for authentication then only i will save the image this will work in iphone and android applications can any one give some suggestions how to achieve this functionality.

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Hello,

I have to query from an iphone application whose url format will be www.sitename.com/methodToCall

So, I had decided on to use HttpHandlers. My website application is working fine if i directly run from visual studio and it is responding to my iphone requests.

But when i host it on my IIS server it is throwing a web exception

"The remote server returned an error: (405) Method Not Allowed."

this is the code in my web.config file

<httpHandlers>
		<add verb="*" path="*" type="rpc"  />
</httpHandlers>

Can some one tell me what is the problem.

thanks in advance.


Exception Handling usinh HttpModules

  

Hi,

I am currently working on Exception Handling using HttpModules. I have developed a simple module, which would write error infor in the page.

The module is working fine, But, when I throw any exception explicitly in Page_Load event, then it can not handle it. Rather a YSOD is comming in the browser.

Here is my code...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

namespaceErrorHandler

 

&nb

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