ASP Error - The HTTP Headers are already written

While redirecting from a page in asp we get a very common error: The HTTP headers are already written to the client browser.

Response object error 'ASP 0156 : 80004005
Header Error
/test.asp, line 135
The HTTP headers are already written to the client browser. Any HTTP header modifications must be made before writing page content.

The Redirect method of the Response object operates by sending the 302 Object Moved response header, plus the new location of the file, to the client. When it receives this response, the user’s browser automatically requests the new page.

Because redirection depends on HTTP headers, which come at the beginning of the document, We can’t redirect once text has been sent to the client. If we redirect in a server-side script after data has been sent to the client, the above error occurs:

As you don’t know at the beginning of the page whether you need to redirect, you have to use the buffering capabilities of the Response object. If Response.Buffer is True, HTML output is collected in a buffer and sent all at once to the client. If at some point we need to redirect to another page, ASP automatically discards any existing output in the buffer when we call Response.Redirect. We may also use Response.Clear at any time to clear the buffer and start again.

So you can now easily avoid the error - The HTTP Headers are already written

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