net/http: omit invalid header value from error message
Updates #43631
Change-Id: I0fe3aafdf7ef889fed1a830128721393f8d020e6
GitHub-Last-Rev:
c359542d741b17f4e2cb0d50982bf341246233b0
GitHub-Pull-Request: golang/go#48979
Reviewed-on: https://go-review.googlesource.com/c/go/+/355929
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>