net/http: use DOMException.message property in error text

Previously, details about the underlying fetch error
were not visible in the net/http error text:

	net/http: fetch() failed: <object>

When using the message property, they are:

	net/http: fetch() failed: Failed to fetch
	net/http: fetch() failed: The user aborted a request.

Reference: https://developer.mozilla.org/en-US/docs/Web/API/DOMException/message.

Change-Id: Iecf7c6bac01abb164731a4d5c9af6582c250a1a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/226205
Reviewed-by: Johan Brandhorst <johan.brandhorst@gmail.com>
1 file changed
tree: a07d3d3bda2d7ef4a6f18496cd6d612aab4cff1e
  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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