cmd/go/internal/web: include snippets of plain-text server responses in error detail

For the server response to be displayed, the response must be served
as type text/plain with charset us-ascii or utf-8, and must consist of
only graphic characters and whitespace.

We truncate the server response at the first blank line or after 8
lines or a fixed number of characters, and tab-indent (if multiple
lines) to ensure that the response is offset from ordinary go command
output.

Fixes #30748

Change-Id: I0bc1d734737e456e3251aee2252463b6355e8c97
Reviewed-on: https://go-review.googlesource.com/c/go/+/189783
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
5 files changed
tree: 17cdcd977da1d59ba4212a410fe73c12187615e6
  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
  18. SECURITY.md
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