Fix case-sensitive detection of streaming event-stream responses

[harsh-thakkar7]

Summary

Servers may send the Content-Type header for Server-Sent Events with any casing (RFC 2045 §5.1: "media types are case-insensitive"). HTTPie's auto-streaming detection compared the parsed media type literally:

is_stream = (content_type_header == 'text/event-stream')

so a response with e.g. Content-Type: Text/Event-Stream silently disabled the documented SSE auto-streaming (falling back to buffered output with chunk_size=102400 instead of line-by-line chunk_size=1).

>>> get_stream_type_and_kwargs(env, opts, HTTPResponse,
...                            {"Content-Type": "Text/Event-Stream"})
(RawStream, {"chunk_size": 102400})   # before: buffered

Fix

Compare the media type case-insensitively:

is_stream = (content_type_header.lower() == 'text/event-stream')

Tests

Added a parametrized case to test_auto_streaming (a Text/Event-Stream response is now streamed line-by-line, yielding 3 writes of test instead of 1 buffered write). The new case fails before this change (1 failed) and passes after (4 passed full suite for the test module).

pytest -q tests/test_stream.py   # 17 passed

[harsh-thakkar7]

Closing this — I don't think this change is mature enough to land right now. Thanks for the project!