Question

Using Visual Studio 2008 and built-in web server.

In a Web Handler .ashx file

    public void ProcessRequest(HttpContext context) {

        context.Response.ContentType = MimeType_text_xvcard;
        context.Response.Headers.Add(HttpHeader_ContentLength, "2138");

when I try to add an HTTP header I get the exception:

This operation requires IIS integrated
pipeline mode.

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.PlatformNotSupportedException:
This operation requires IIS integrated
pipeline mode.

I can find information about this error on the Internet but need specific info about how to presumably enable Integrated Pipeline mode (through web.config?) to allow HTTP headers to be manipulated.

How do do I put the built-in web server into integrated pipeline mode?
Note: Not using full-fledged IIS

Answer 1

Try replacing

context.Response.Headers.Add 

with

context.Response.AddHeader

(courtesy of this site)

I believe you have to be running IIS7 (in Integrated Pipeline mode) to use Headers.Add