* 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.
* Restore 2.14 getwithbase, add a new method for class key deduplication
* Use the original getwithbase code, not some equivalent
* Fix mocking
* Test key exceptions
* Restore 2.14 getwithbase, add a new method for class key deduplication
* Use the original getwithbase code, not some equivalent
* Fix mocking
* Test key exceptions
* 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.
* Cover 2.15.0 in the release notes (up to 31bf7c3).
* Replace VERSION.
* Document unified download handler exceptions.
* Updates.
* Cover 2.15.0 in the release notes (up to 0c6ccf5).
* Cover 2.15.0 in the release notes (up to b68f267).
* Run linkcheck and fix issues.
* Cleanup unused link targets.
* Cleanup.
* Use AsyncCrawlerProcess if TWISTED_REACTOR_ENABLED=False.
* defer.Deferred -> Deferred.
* Allow Shell with TWISTED_REACTOR_ENABLED=False.
* Shell workflow notes.
* Remove an unused argument.
* Shell.fetch_available.
* Shell._use_reactor.
* Some more comments.
* Simplify _schedule() and fix the spider shell var.
* More async def.
* Reactorless shell support.
* Add pragma: no cover.
* More notes.
* Remove a TODO.