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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 21955] - Dynamically generated HTML pages compressed with mod_deflate are sometimes truncated
Date Wed, 22 Oct 2003 15:53:51 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=21955

Dynamically generated HTML pages compressed with mod_deflate are sometimes truncated





------- Additional Comments From chrisn@capitalstream.com  2003-10-22 15:53 -------
I was having a problem almost exactly like this.  We are using Tomcat and were 
getting partial pages back from the server.  It turned out that mod_deflate has 
an error which was posted to another mailing list (and supposedly fixed in 
2.0.48) which occured when a perl script printed "".  This would cause a blank 
buffer to appear in the chain of output filter buffers and mod_deflate would 
attempt to compress it and generate an error (which would terminate the output 
stream).  Here is the relavant code in mod_deflate

Around line 538:

532,534c532,537
<             zRC = deflate(&(ctx->stream), Z_SYNC_FLUSH);
<             if (zRC != Z_OK) {
<                 return APR_EGENERAL;
---
>             //  FIX:  ensure that stream has bytes available before attempting
 to compress
>                       if (ctx->stream.avail_in > 0) {
>                 zRC = deflate(&(ctx->stream), Z_SYNC_FLUSH);
>                 if (zRC != Z_OK) {
>                     return APR_EGENERAL;
>                 }
536d538
<

we were seeing this problem all the time (esp. on larger pages and with slower 
pipes) and have not heard a wisper from it for several days once this patch was 
applied.

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