4

I would like some curl command, possibly with some bash hackery, that:

  1. Outputs any 2xx responses to a file
  2. Outputs any non-2xx responses to stderr
  3. Exits with a nonzero status code when a non-2xx response occurs

I know that the -f flag will get me 3, and that -o or pipe redirection will get me 1. But I cannot then figure out how to get 2.

5
  • Shot in the dark, but it looks like a combination of --output, --silent, and --show-errors might do the trick? – Justin Niessner Sep 1 '15 at 0:35
  • Thanks; I tried that and it seems like --output always wins :( – Domenic Sep 1 '15 at 0:46
  • Are you sure? curl -fsS -o filename http://example.com/ works. – 200_success Sep 1 '15 at 3:46
  • (confirmed using curl 7.43.0) – 200_success Sep 1 '15 at 3:53
  • @200_success I just tried that and it gave me "curl: (22) The Requested URL returned error: 500 Internal Server Error" instead of the actual response body. – Domenic Sep 2 '15 at 19:07
1

Could you echo the output from curl into a temp file (with the PID as part of the name). Set a timer in the background for a long time (5+ min to delete the file). Then run a sed command for #1 to a file, and then a sed command for #2 to STDerror. The second command can use the q command to return a non-zero answer. Look here for use of q command in sed. https://stackoverflow.com/questions/15965073/return-code-of-sed-for-no-match

0

This is what I ended up doing:

HTTP_CODE=`curl http://example.com/ \
      --verbose \
      --write-out "%{http_code}" \
      --output my-output-file`

if [ "$HTTP_CODE" != "200" ]; then
    cat my-output-file
    rm my-output-file
fi

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.