Does his happen with browsers other than Firefox? Graham
On 20 August 2010 12:16, Catalin Patulea <[email protected]> wrote: > Hi, > > I'm having performance problems with mod_wsgi+mod_deflate. When the > gzip output encoding is in effect, responses takes a long time to > complete (625 ms) even though no data is being sent during the last > ~600 ms. > > Here is my test application: > > #!/usr/bin/python > def application(environ, start_response): > status = "200 OK" > output = "Hello, world 2!" > > response_headers = [("Content-Type", "text/plain"), > ("Content-Length", str(len(output)))] > start_response(status, response_headers) > > return [output] > > This is being run under Apache 2.2 with mod_wsgi 2.5 in daemon mode. > Apache has mod_deflate enabled for content type text/plain, and here > are the response headers: > > Date: Fri, 20 Aug 2010 01:51:31 GMT > Server: Apache/2.2.12 (Ubuntu) > Vary: Accept-Encoding > Content-Encoding: gzip > Keep-Alive: timeout=15, max=94 > Connection: Keep-Alive > Transfer-Encoding: chunked > Content-Type: text/plain > > This seems to cause Firefox to wait for a long time until deciding > it's the end of content (625 ms). The Firebug request timeline looks > like: > > 0 Started > 0 0 DNS Lookup > 0 0 Connecting > 0 0 Blocking > 0 0 Sending > 0 31ms Waiting > +31ms 594ms Receiving > +631ms 'DOMContentLoaded' (event) > +644ms 'load' (event) > > If I set the Content-Type so that mod_deflate doesn't match it and the > content is sent plainly (without mod_deflate), Content-Length is > passed through nicely and the requests complete in < 50 ms: > > HTTP/1.1 200 OK > Date: Fri, 20 Aug 2010 02:11:22 GMT > Server: Apache/2.2.12 (Ubuntu) > Content-Length: 15 > Keep-Alive: timeout=15, max=99 > Connection: Keep-Alive > Content-Type: text/plain,frigoffdeflate > > And response timeline: > > 0 Started > 0 0 DNS Lookup > 0 0 Connecting > 0 0 Blocking > 0 0 Sending > 0 32ms Waiting > +32ms 0 Receiving > +91ms 'DOMContentLoaded' (event) > +109ms 'load' (event) > > Ideally I would like to have mod_deflate working to reduce transfer > time, but also have it send Content-Length for the compressed content > so responses complete as soon as the data is finished. This appears to > be the case when Apache serves static files with mod_deflate: > > HTTP/1.1 200 OK > Date: Fri, 20 Aug 2010 02:12:12 GMT > Server: Apache/2.2.12 (Ubuntu) > Last-Modified: Wed, 04 Aug 2010 06:49:27 GMT > Etag: "25b51d-167-48cf9d5b50bc0" > Accept-Ranges: bytes > Vary: Accept-Encoding > Content-Encoding: gzip > Content-Length: 201 > Keep-Alive: timeout=15, max=97 > Connection: Keep-Alive > Content-Type: text/css > > Any idea how to the this working properly? > > Thanks, > Catalin > > -- > You received this message because you are subscribed to the Google Groups > "modwsgi" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/modwsgi?hl=en. > > -- You received this message because you are subscribed to the Google Groups "modwsgi" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/modwsgi?hl=en.
