What is an HttpHandler in ASP NET

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What is an HttpHandler in ASP NET  Why and how is it used

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An ASP NET HTTP handler is the process  frequently referred to as the  endpoint   that runs in response to a request made to an ASP NET Web application  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler  You can create your own HTTP handlers that render custom output to the browser

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An HttpHandler  or IHttpHandler  is basically anything that is responsible for serving content  An ASP NET page  aspx  is a type of handler   You might write your own  for example  to serve images etc from a database rather than from the web-server itself  or to write a simple POX service  rather than SOAP WCF etc

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In the simplest terms  an ASP NET HttpHandler is a class that implements the System Web IHttpHandler interface    ASP NET HTTPHandlers are responsible for intercepting requests made to your ASP NET web application server  They run as processes in response to a request made to the ASP NET Site  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler    ASP NET offers a few default HTTP handlers    Page Handler   aspx   handles Web pages User Control Handler   ascx   handles Web user control pages Web Service Handler   asmx   handles Web service pages Trace Handler  trace axd   handles trace functionality   You can create your own custom HTTP handlers that render custom output to the browser  Typical scenarios for HTTP Handlers in ASP NET are for example   delivery of dynamically created images  charts for example  or resized pictures  RSS feeds which emit RSS-formated XML   You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property   The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse  to increase performance  or whether a new handler is required for each request

User · Answer

In the simplest terms  an ASP NET HttpHandler is a class that implements the System Web IHttpHandler interface    ASP NET HTTPHandlers are responsible for intercepting requests made to your ASP NET web application server  They run as processes in response to a request made to the ASP NET Site  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler    ASP NET offers a few default HTTP handlers    Page Handler   aspx   handles Web pages User Control Handler   ascx   handles Web user control pages Web Service Handler   asmx   handles Web service pages Trace Handler  trace axd   handles trace functionality   You can create your own custom HTTP handlers that render custom output to the browser  Typical scenarios for HTTP Handlers in ASP NET are for example   delivery of dynamically created images  charts for example  or resized pictures  RSS feeds which emit RSS-formated XML   You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property   The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse  to increase performance  or whether a new handler is required for each request

User · Answer

An ASP NET HTTP handler is the process  frequently referred to as the  endpoint   that runs in response to a request made to an ASP NET Web application  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page via the page handler   The ASP NET page handler is only one type of handler  ASP NET comes with several other built-in handlers such as the Web service handler for  asmx files   You can create custom HTTP handlers when you want special handling that you can identify using file name extensions in your application  For example  the following scenarios would be good uses of custom HTTP handlers   RSS feeds   To create an RSS feed for a site  you can create a handler that emits RSS-formatted XML  You can then bind the  rss extension  for example  in your application to the custom handler  When users send a request to your site that ends in  rss  ASP NET will call your handler to process the request   Image server   If you want your Web application to serve images in a variety of sizes  you can write a custom handler to resize images and then send them back to the user as the handler s response   HTTP handlers have access to the application context  including the requesting user s identity  if known   application state  and session information  When an HTTP handler is requested  ASP NET calls the ProcessRequest method on the appropriate handler  The handler s ProcessRequest method creates a response  which is sent back to the requesting browser  As with any page request  the response goes through any HTTP modules that have subscribed to events that occur after the handler has run

User · Answer

Any Class that implements System Web IHttpHandler Interface becomes HttpHandler  And this class run as processes in response to a request made to the ASP NET Site   The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler The Class that implements System Web IHttpHandler Interface    You can create your own custom HTTP handlers that render custom output to the browser   Some ASP NET default handlers are     Page Handler   aspx      Handles Web pages User Control Handler   ascx      Handles Web user control pages Web Service Handler   asmx      Handles Web service pages Trace Handler  trace axd      Handles trace functionality

User · Answer

HttpHandler Example  HTTP Handler in ASP NET 2 0 A handler is responsible for fulfilling requests from a browser  Requests that a browser manages are either handled by file extension or by calling the handler directly The low level Request and Response API to service incoming Http requests are Http Handlers in Asp Net  All handlers implement the IHttpHandler interface  which is located in the System Web namespace  Handlers are somewhat analogous to Internet Server Application Programming Interface  ISAPI  extensions  You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property  The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse to increase performance or whether a new handler is required for each request  The  ashx file extension is reserved for custom handlers  If you create a custom handler with a file name extension of  ashx  it will automatically be registered within IIS and ASP NET  If you choose to use an alternate file extension  you will have to register the extension within IIS and ASP NET  The advantage of using an extension other than  ashx is that you can assign multiple file extensions to one handler  Configuring HTTP Handlers The  configuration section handler is responsible for mapping incoming URLs to the IHttpHandler or IHttpHandlerFactory class  It can be declared at the computer  site  or application level  Subdirectories inherit these settings  Administrators use the  tag directive to configure the  section   directives are interpreted and processed in a top-down sequential order  Use the following syntax for the  section handler   Creating HTTP Handlers To create an HTTP handler  you must implement the IHttpHandler interface  The IHttpHandler interface has one method and one property with the following signatures  void ProcessRequest HttpContext   bool IsReusable  get

User · Answer

Any Class that implements System Web IHttpHandler Interface becomes HttpHandler  And this class run as processes in response to a request made to the ASP NET Site   The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler The Class that implements System Web IHttpHandler Interface    You can create your own custom HTTP handlers that render custom output to the browser   Some ASP NET default handlers are     Page Handler   aspx      Handles Web pages User Control Handler   ascx      Handles Web user control pages Web Service Handler   asmx      Handles Web service pages Trace Handler  trace axd      Handles trace functionality

User · Answer

An HttpHandler  or IHttpHandler  is basically anything that is responsible for serving content  An ASP NET page  aspx  is a type of handler   You might write your own  for example  to serve images etc from a database rather than from the web-server itself  or to write a simple POX service  rather than SOAP WCF etc

User · Answer

In the simplest terms  an ASP NET HttpHandler is a class that implements the System Web IHttpHandler interface    ASP NET HTTPHandlers are responsible for intercepting requests made to your ASP NET web application server  They run as processes in response to a request made to the ASP NET Site  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler    ASP NET offers a few default HTTP handlers    Page Handler   aspx   handles Web pages User Control Handler   ascx   handles Web user control pages Web Service Handler   asmx   handles Web service pages Trace Handler  trace axd   handles trace functionality   You can create your own custom HTTP handlers that render custom output to the browser  Typical scenarios for HTTP Handlers in ASP NET are for example   delivery of dynamically created images  charts for example  or resized pictures  RSS feeds which emit RSS-formated XML   You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property   The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse  to increase performance  or whether a new handler is required for each request

User · Answer

An ASP NET HTTP handler is the process  frequently referred to as the  endpoint   that runs in response to a request made to an ASP NET Web application  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler  You can create your own HTTP handlers that render custom output to the browser

User · Answer

In the simplest terms  an ASP NET HttpHandler is a class that implements the System Web IHttpHandler interface    ASP NET HTTPHandlers are responsible for intercepting requests made to your ASP NET web application server  They run as processes in response to a request made to the ASP NET Site  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page through the page handler    ASP NET offers a few default HTTP handlers    Page Handler   aspx   handles Web pages User Control Handler   ascx   handles Web user control pages Web Service Handler   asmx   handles Web service pages Trace Handler  trace axd   handles trace functionality   You can create your own custom HTTP handlers that render custom output to the browser  Typical scenarios for HTTP Handlers in ASP NET are for example   delivery of dynamically created images  charts for example  or resized pictures  RSS feeds which emit RSS-formated XML   You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property   The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse  to increase performance  or whether a new handler is required for each request

User · Answer

An HttpHandler  or IHttpHandler  is basically anything that is responsible for serving content  An ASP NET page  aspx  is a type of handler   You might write your own  for example  to serve images etc from a database rather than from the web-server itself  or to write a simple POX service  rather than SOAP WCF etc

User · Answer

An ASP NET HTTP handler is the process  frequently referred to as the  endpoint   that runs in response to a request made to an ASP NET Web application  The most common handler is an ASP NET page handler that processes  aspx files  When users request an  aspx file  the request is processed by the page via the page handler   The ASP NET page handler is only one type of handler  ASP NET comes with several other built-in handlers such as the Web service handler for  asmx files   You can create custom HTTP handlers when you want special handling that you can identify using file name extensions in your application  For example  the following scenarios would be good uses of custom HTTP handlers   RSS feeds   To create an RSS feed for a site  you can create a handler that emits RSS-formatted XML  You can then bind the  rss extension  for example  in your application to the custom handler  When users send a request to your site that ends in  rss  ASP NET will call your handler to process the request   Image server   If you want your Web application to serve images in a variety of sizes  you can write a custom handler to resize images and then send them back to the user as the handler s response   HTTP handlers have access to the application context  including the requesting user s identity  if known   application state  and session information  When an HTTP handler is requested  ASP NET calls the ProcessRequest method on the appropriate handler  The handler s ProcessRequest method creates a response  which is sent back to the requesting browser  As with any page request  the response goes through any HTTP modules that have subscribed to events that occur after the handler has run

User · Answer

HttpHandler Example  HTTP Handler in ASP NET 2 0 A handler is responsible for fulfilling requests from a browser  Requests that a browser manages are either handled by file extension or by calling the handler directly The low level Request and Response API to service incoming Http requests are Http Handlers in Asp Net  All handlers implement the IHttpHandler interface  which is located in the System Web namespace  Handlers are somewhat analogous to Internet Server Application Programming Interface  ISAPI  extensions  You implement the IHttpHandler interface to create a synchronous handler and the IHttpAsyncHandler interface to create an asynchronous handler  The interfaces require you to implement the ProcessRequest method and the IsReusable property  The ProcessRequest method handles the actual processing for requests made  while the Boolean IsReusable property specifies whether your handler can be pooled for reuse to increase performance or whether a new handler is required for each request  The  ashx file extension is reserved for custom handlers  If you create a custom handler with a file name extension of  ashx  it will automatically be registered within IIS and ASP NET  If you choose to use an alternate file extension  you will have to register the extension within IIS and ASP NET  The advantage of using an extension other than  ashx is that you can assign multiple file extensions to one handler  Configuring HTTP Handlers The  configuration section handler is responsible for mapping incoming URLs to the IHttpHandler or IHttpHandlerFactory class  It can be declared at the computer  site  or application level  Subdirectories inherit these settings  Administrators use the  tag directive to configure the  section   directives are interpreted and processed in a top-down sequential order  Use the following syntax for the  section handler   Creating HTTP Handlers To create an HTTP handler  you must implement the IHttpHandler interface  The IHttpHandler interface has one method and one property with the following signatures  void ProcessRequest HttpContext   bool IsReusable  get

User · Answer

An HttpHandler  or IHttpHandler  is basically anything that is responsible for serving content  An ASP NET page  aspx  is a type of handler   You might write your own  for example  to serve images etc from a database rather than from the web-server itself  or to write a simple POX service  rather than SOAP WCF etc

[asp.net] What is an HttpHandler in ASP.NET

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