Answer Posted / sp

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.
To create a custom HTTP handler, you create a class that
implements the IHttpHandler interface to create a
synchronous handler or the IHttpAsyncHandler to create an
asynchronous handler. Both handler interfaces require you
to implement the IsReusable property and the ProcessRequest
method. The IsReusable property specifies whether the
IHttpHandlerFactory object (the object that actually calls
the appropriate handler) can place your handlers in a pool
and reuse them to increase performance, or whether it must
create new instances every time the handler is needed. The
ProcessRequest method is responsible for actually
processing the individual HTTP requests.

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