Revert recent timeout behaviour change

A recent change had an unintended effect of considering time to read response bodies in each request deadline. This has been reverted.

Allow case sensitive headers in attacks

This release enables using case sensitive headers in attacks. Thanks to @hi-t-ch for the initial discussion and to @GeertJohan to follow up.

Major performance improvements

This release brings major improvements to vegeta's performance and how much throughput it can generate reliably.

• Major performance improvements that allow much higher attack rates
• Expose connections flag in the attack command
• Add global cpu and heap profiling flags
• Measure actual attack rate and print it in relevant reporters

Thanks to @vdel26 who kicked this off with #120 and to @giltene for inspiration with his previous feedback and work on https://github.com/giltene/wrk2.

Plot reporter improvements

• Update dygraph to latest version
• Improve plot reporter screenshot rendering by using html2canvas.js
• Improve plot reporter performance

Thanks to @nathany for reporting: #119

Allow spaces in report histogram flag format

This release allows spaces in the report command hist reporter flag format. This means that passing hist[0,5ms] and hist[0, 5ms] to the -reporter flag of the report command is equivalent.

Version flag, default dumper and regression fix

This release adds a --version flag to the vegeta command, sets the default dumper as json so you don't have to type the extra flag for the common use case and fixes a regression introduced by the previous release.

Bug fix

This release fixes a bug that incorrectly counted the number of bytes received in response bodies.
Thanks to @pwaller for reporting it in #113.

Only use status text as error message

This release fixes a bug introduced in the previous release which included full response bodies as error messages.
#108

Treat [200...399] status code range as errors

This release fixes a bug that didn't treat responses with status codes outside the [200...399] range as errors. Thanks to @davideicardi for reporting it.

Dump command

This release implements a dump command which outputs piped attack results in different formats.

$ vegeta dump -h
Usage of vegeta dump:
  -dumper="": Dumper [json, csv]
  -inputs="stdin": Input files (comma separated)
  -output="stdout": Output file

-inputs

Specifies the input files containing attack results to be dumped. You can specify more than one (comma separated).

-output

Specifies the output file to which the dump will be written to.

-dumper

Specifies the dump format.

json

Dumps attack results as JSON objects.

csv

Dumps attack results as CSV records with six columns.
The columns are: unix timestamp in ns since epoch, http status code,
request latency in ns, bytes out, bytes in, and lastly the error.