* Add support for HTTP/2 and SOCKS proxies to HttpxDownloadHandler.
* Update the docs.
* Trim the tables.
* Restore lost wording.
* Handlers docs improvements and fixes.
* Run mitmproxy-based tests for every handler and improve them.
* Fixes for H2DownloadHandler.
* Revert "Fixes for H2DownloadHandler."
This reverts commit bcdbd097cd.
* Add TestHttpsProxy for HTTP11DownloadHandler.
* Use the configured context factory in ScrapyProxyAgent.
* Reword.
* Reword.
* pragma: no cover for H2DownloadHandler proxy code.
* Raise an exception for HTTPS proxies instead of using HTTP.
* Remove non-working proxy support and explicitly forbid HTTP.
* pragma: no cover
* Add a docs note about HTTPS proxies.
* Rename ScrapyProxyAgent.
* Popen cleanup.
* Improve the test for response headers.
* Fix default headers of Httpx and H2 handlers, add tests.
* Check Location in redirect tests.
* Simplify bindaddress tests.
* Add download_latency to HttpxDownloadHandler, add tests.
* Remove explicit method="GET".
* Don't expect a specific value in test_download_with_maxsize_very_large_file
* Use a non-existent scheme in test_unsupported_scheme.
* Remporarily rollback the test_download_latency test check.
* Better check in test_download_latency.
* Improve logic for StreamCloseReason.CANCELLED.
Andrey Rakhmatullin
Julian Hamze