[release-branch.go1.15] net/http: speed up and deflake TestCancelRequestWhenSharingConnection

This test made many requests over the same connection for 10
seconds, trusting that this will exercise the request cancelation
race from #41600.

Change the test to exhibit the specific race in a targeted fashion
with only two requests.

Fixes #47534.
Updates #41600.
Updates #47016.

Change-Id: If99c9b9331ff645f6bb67fe9fb79b8aab8784710
Reviewed-on: https://go-review.googlesource.com/c/go/+/339594
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
(cherry picked from commit 6e738868a7a943d7d4fd6bb1963e7f6d78111726)
Reviewed-on: https://go-review.googlesource.com/c/go/+/339829
1 file changed
tree: d8be669720b5de1cf0e4d2099c0f02d007e449b6
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  13. favicon.ico
  16. README.md
  17. robots.txt
  18. SECURITY.md

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