Random _transferSize values

I have a demo site running HTTP\2.0 here and its just downloads 50 Javascript objects of all the same size.

When I open chrome manually and grab the HAR I always will get a _transferSize of 20250 for every one

When I use the chrome-har-capturer

var chc = require('chrome-har-capturer');
var c = chc.load(['https://http2optimization.com/W_2_2_a/']);
c.on('end', function (har) {
   console.log ( har );
});

Not only do I get _transferSize of 20027 but sometimes I will get random lower values ranging from 0 - 20000 for like 1 or 2 of the 50 files

I also notice the files that get a random less _transferSize will have way quicker timing values as well

Also: I am running chrome headless with the --incognito flag as well so there is no way it should be caching any of it neither

[cyrus-and]

@benschwarz done.

[benschwarz]

Additional (maybe) interest:

• Version 0.8.1 reported

basename    httpVersion  headersSize  bodySize  _transferSize  contentSize
----------  -----------  -----------  --------  -------------  -----------
W_2_2_a     h2           -1           -1        0              195
object1.js  h2           -1           -1        150696         166666
object2.js  h2           -1           -1        166855         166666
object3.js  h2           -1           -1        166855         166666

• Version 0.7.0 reported:

basename    httpVersion  headersSize  bodySize  _transferSize  contentSize
----------  -----------  -----------  --------  -------------  -----------
W_2_2_a     h2           336          -336      0              195
object1.js  h2           372          150324    150696         166666
object2.js  h2           372          166483    166855         166666
object3.js  h2           372          166483    166855         166666

Saving the har from Chrome devtools, loading and running the object through the test script observed:

basename    httpVersion  headersSize  bodySize  _transferSize  contentSize
----------  -----------  -----------  --------  -------------  -----------
W_2_2_a     unknown      -1           -1        341            195
object1.js  unknown      -1           -1        167080         166666
object2.js  unknown      -1           -1        167080         166666
object3.js  unknown      -1           -1        167080         166666