net/http: add Transport.MaxConnsPerHost knob

Add field to http.Transport which limits connections per host,
including dial-in-progress, in-use and idle (keep-alive) connections.

For HTTP/2, this field only controls the number of dials in progress.

Fixes #13957

Change-Id: I7a5e045b4d4793c6b5b1a7191e1342cd7df78e6c
Reviewed-on: https://go-review.googlesource.com/71272
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
3 files changed
tree: ce4445785cc3e0c872e02b378deafec3e8c4b69d
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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