how to debug why pagespeed is off for one request?

[Alex Wu]

Hi, I am testing pagespeed with https://teams.microsoft.com/. I always got pagespeed is off from debug log. I searched hostname, didn't see anywhere the pagespeed is off for the hostname. What other reasons that pagespeed can be off for this response? The content type is text/html. Where should I add debug statements to trace the rason why pagespeed is off for this reponse?

Alex

[Otto van der Schaaf]

A good entrypoint may be https://github.com/pagespeed/mod_pagespeed/blob/master/net/instaweb/rewriter/rewrite_query.cc

It's a shot in the dark, but if the server responds with "cache-control: no-transform", pagespeed may decline optimization. I'm not sure that this applies to html streams in your setup, but it might be worth checking.

If you are running into that, you can toggle an option to tweak the behaviour: https://modpagespeed.com/doc/configuration#notransform

Otto

On Mon, Mar 13, 2017 at 5:42 PM Alex Wu <yw9...@gmail.com> wrote:

Hi, I am testing pagespeed with https://teams.microsoft.com/. I always got pagespeed is off from debug log. I searched hostname, didn't see anywhere the pagespeed is off for the hostname. What other reasons that pagespeed can be off for this response? The content type is text/html. Where should I add debug statements to trace the rason why pagespeed is off for this reponse?

Alex

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[Alex Wu]

Thank you very much. I'll look into it from your clues.

Alex