Automatically enable --stream on server sent events

[isidentical]

Resolves #376.

[codecov-commenter]

Codecov Report

Merging #1226 (55f4c2c) into master (4d7d6b6) will decrease coverage by 0.55%.
The diff coverage is 95.05%.

❗ Current head 55f4c2c differs from pull request most recent head fd8897e. Consider uploading reports for the commit fd8897e to get more accurate results

@@            Coverage Diff             @@
##           master    #1226      +/-   ##
==========================================
- Coverage   97.28%   96.72%   -0.56%     
==========================================
  Files          67       81      +14     
  Lines        4235     5409    +1174     
==========================================
+ Hits         4120     5232    +1112     
- Misses        115      177      +62     

Impacted Files	Coverage Δ
tests/test_binary.py	100.00% <ø> (ø)
httpie/compat.py	31.11% <27.90%> (-68.89%)	⬇️
tests/conftest.py	77.14% <58.33%> (-9.82%)	⬇️
tests/test_ssl.py	91.01% <66.66%> (-3.93%)	⬇️
httpie/manager/__main__.py	82.35% <82.35%> (ø)
httpie/models.py	94.73% <83.33%> (-2.64%)	⬇️
httpie/output/formatters/colors.py	92.66% <88.88%> (-0.92%)	⬇️
httpie/manager/core.py	92.85% <92.85%> (ø)
httpie/manager/plugins.py	93.39% <93.39%> (ø)
httpie/plugins/manager.py	96.87% <95.00%> (+4.98%)	⬆️
... and 57 more

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[isidentical]

The reason for these changes is that, httpbin mirrors the headers when it is responding. Since it is also mirroring the Transfer-Encoding, we treat this response as if it was chunked and use different delimiting techniques. So because of that, we stop formatting it as JSON, and not decode the actual unicode symbols (since that happens on formatting). Which I think is a plausible behavior, considering in this case, the server is the wrong side.

[isidentical]

Tests are failing on 3.7/3.6, probably due to some mocking behavior changes. Will look at them on the morning.

[jkbrzt]

Why is it enabled for all chunked responses? This really only makes sense for server-sent events, where each line can be considered a body. https://httpie.io/docs#disabling-buffering

[isidentical]

Why is it enabled for all chunked responses? This really only makes sense for server-sent events, where each line can be considered a body.

Ah, alright! Will do that then, thanks for the correction. I thought you initially meant enabling this for all chunked responses, since the quote in this implied that. Will fix it!

[mivade]

Woah, this is great! I'm not using SSE as much as I was when I filed #376 but this is really nice to see.