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60186Re: mod_perl2, HEAD request and Content-Length

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  • Stas Bekman
    Aug 4, 2004
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      Glenn Strauss wrote:
      > On Mon, Aug 02, 2004 at 11:55:56AM -0700, Stas Bekman wrote:
      > [...]

      > I mentioned to Geoff off-list about possibly using a flush bucket,
      > since I don't have a test setup ready (just replaced my dead
      > laptop hard drive)

      Thanks Glenn, calling $r->rflush works perfectly fine to cause
      user-preset C-L header to be delivered to the client on HEAD request.

      > I wrote:
      >>>I used to make good use of $r->send_http_header() in my MP1 handlers.
      >>>This method isn't available in MP2 (why?), though I could picture it
      >>>replaced by sending a flush bucket down the filter chain.
      > On Tue, Aug 03, 2004 at 10:04:38AM -0400, Geoffrey Young wrote:
      >>apache now sends the headers for you via the header filter. if you were
      >>allowed to send your own headers you might send them before a filter ran
      >>that would alter the headers. for instance, mod_include removes the ETag

      I think this is not the reason why ap_send_http_header was removed from
      Apache2 API. It's simply not needed because the headers_out filter will
      inject the headers as soon as some body is sent. Your example of
      mod_include doesn't work if the response handler does:

      $r->print("foo bar");
      $r->rflush; # or if the previous print was big enough to cause flush
      $r->print(q[<!--#include virtual="/foo" -->]);

      > Would a flush bucket be a great way to say "send headers now"?
      > So if you're not going to send the actual content down the filter chain
      > on a HEAD request, would sending a flush bucket make things happy?

      It does.

      > IIF this works, can I make a request the $r->send_http_header() be
      > implemented in Apache2 to do just that? (create and pass a flush bucket)

      Absolutely. But it'd be nice if you could first ask the httpd-dev list:
      if they are interested in adding the C API to do that.

      If httpd-dev doesn't do it, I suppose we can still implement it in mp2.

      Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
      http://stason.org/ mod_perl Guide ---> http://perl.apache.org
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