HTTP Header Compression Tests
The test can be run like this:
./compare_compressors.py [options] list-of-har-files
The most important option is -c, which specifies what compressors to run. Current codecs include:
- http1_gzip - gzip compression of HTTP1.x headers
- spdy3 - SPDY 3's gzip-based compression
- delta - draft-rpeon-httpbis-header-compression implementation
- fork - fork a process; see below
Interpreting Text Results
Results will look something like:
* TOTAL: 1012 req messages size time | ratio min max std http1 830,970 0.05 | 1.00 1.00 1.00 0.00 simple 320,883 0.05 | 0.39 0.07 0.92 0.24 spdy3 85,492 0.06 | 0.10 0.03 0.66 0.08 * TOTAL: 1012 res messages size time | ratio min max std http1 424,075 0.04 | 1.00 1.00 1.00 0.00 simple 176,216 0.12 | 0.42 0.11 0.95 0.12 spdy3 80,706 0.07 | 0.19 0.04 0.68 0.09
The 'size' column shows how many bytes the compression algorithm outputs; 'time' shows how much CPU time it roughly took; 'ratio' shows the ratio to the baseline (http1, by default), and the 'min', 'max' and 'std; columns show the minimum, maximum and standard deviations of the ratios, respectively.
Showing Message Graphs
When the "-t" option is used, TSV output is created. E.g.,
./compare_compressors.py -t my.har
This will create two TSV files, req.tsv and res.tsv, that can then be displayed by the display_tsv.html file. See an example.
Adding New Compression Algorithms
If you wish to implement a new codec, there are two easy approaches.
1) Develop it in Python. New modules should be subdirectories of 'compressor', and should inherit from BaseProcessor there.
2) Develop it in another language, and use the 'fork' module to execute it in a separate process. See 'sample_exec_codec.py' for an example of this; it can be run like this:
./compare_compressors.py -c fork="sample_exec_codec.py" file.har
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