net/http: using errors.Is in fs error detection
Compare error by errors.Is to detect wrapped fs errors.
Fixes #44923
Change-Id: Idf32b96a661728278b7006c3b3bcc581b8588259
GitHub-Last-Rev:
dba01ddae06947fb8c6047ddfba108acd650f446
GitHub-Pull-Request: golang/go#45314
Reviewed-on: https://go-review.googlesource.com/c/go/+/306051
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>