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WHat is "http headers"?

Discussion in 'C#' started by gilgalbiblewheel, Sep 12, 2005.

  1. #1
    The redirect page is giving error.

    SEMrush
     
    gilgalbiblewheel, Sep 12, 2005 IP
    SEMrush
  2. ServerUnion

    ServerUnion Peon

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    #2
    sounds like you are trying to do a redirect after data has been sent to the browser.

    "Any HTTP header modifications must be made before writing page content."

    Good luck
     
    ServerUnion, Sep 12, 2005 IP
  3. exam

    exam Peon

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    #3
    This usually means there was some error and with the error it outputs some error message to the browser and it has to send the headers to be able to do this. Then when you get to your code that sends headers, oops they have already been sent.
     
    exam, Sep 12, 2005 IP
  4. vectorgraphx

    vectorgraphx Guest

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    #4
    try putting this at the top of your page:

    <%response.buffer=true%>
     
    vectorgraphx, Sep 13, 2005 IP
  5. J.D.

    J.D. Peon

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    #5
    What happens is that you are trying to set a new header not at the beginning of the page, when some of the response, including HTTP headers was already sent to the user. In other words, if you have something like this:

    Response.Write(somedata);
    Response.AddHeader(header, value);

    , you may get this error, depending on how much data is being sent in the first call.

    Move your call that modifies headers (e.g. AddHeader, Redirect, etc) to the beginning of the page and this problem will go away.

    J.D.
     
    J.D., Sep 13, 2005 IP
  6. ServerUnion

    ServerUnion Peon

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    #6

    I place this on most of my pages, works great.
     
    ServerUnion, Sep 13, 2005 IP
  7. J.D.

    J.D. Peon

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    #7
    It's turned on by default - no need to make ASP process more directives than it needs :)

    J.D.
     
    J.D., Sep 13, 2005 IP
  8. ServerUnion

    ServerUnion Peon

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    #8
    depends on your version of ISS you are running. If was turned on, he wouldn't be getting the error...
     
    ServerUnion, Sep 13, 2005 IP