About Apache Compression and Content-Length Header

Just resolved an interesting problem today, one of our code breaks because the response header set by the web server did not include Content-Length.

Spent quite a while investigating and turns out this is due to gzip compression. As seen below Content-Encoding is gzip and I think this causes Content-Length to be omitted.


Gzip compression can be disabled on apache via .htaccess config. In my case I disabled all compression to swf file by adding following configuration

<FilesMatch "\.swf$">
  SetEnv no-gzip 1

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