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Curl to return http status code along with the response

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我在风中等你
我在风中等你 2020-12-04 08:24

I use curl to get http headers to find http status code and also return response. I get the http headers with the command

curl -I http://localhost
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  • 长情又很酷
    2020-12-04 08:29

    I was able to get a solution by looking at the curl doc which specifies to use - for the output to get the output to stdout.

    curl -o - http://localhost

    To get the response with just the http return code, I could just do

    curl -o /dev/null -s -w "%{http_code}\n" http://localhost
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  • 逝去的感伤
    2020-12-04 08:29

    Append a line "http_code:200" at the end, and then grep for the keyword "http_code:" and extract the response code.

    result=$(curl -w "\nhttp_code:%{http_code}" http://localhost)

echo "result: ${result}"   #the curl result with "http_code:" at the end

http_code=$(echo "${result}" | grep 'http_code:' | sed 's/http_code://g') 

echo "HTTP_CODE: ${http_code}"  #the http response code

    In this case, you can still use the non-silent mode / verbose mode to get more information about the request such as the curl response body.

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  • 我在风中等你
    2020-12-04 08:33

    This is a way to retrieve the body "AND" the status code and format it to a proper json or whatever format works for you. Some may argue it's the incorrect use of write format option but this works for me when I need both body and status code in my scripts to check status code and relay back the responses from server.

    curl -X GET -w "%{stderr}{\"status\": \"%{http_code}\", \"body\":\"%{stdout}\"}"  -s -o - “https://github.com” 2>&1

    run the code above and you should get back a json in this format:

    {
"status" : <status code>,
"body" : <body of response>
}

    with the -w write format option, since stderr is printed first, you can format your output with the var http_code and place the body of the response in a value (body) and follow up the enclosing using var stdout. Then redirect your stderr output to stdout and you'll be able to combine both http_code and response body into a neat output

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  • 借酒劲吻你
    2020-12-04 08:34

    This command

     curl http://localhost -w ", %{http_code}"

    will get the comma separated body and status; you can split them to get them out.

    You can change the delimiter as you like.

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  • 盖世英雄少女心
    2020-12-04 08:42

    My way to achieve this:

    To get both (header and body), I usually perform a curl -D- <url> as in:

    $ curl -D- http://localhost:1234/foo
HTTP/1.1 200 OK
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/json
Date: Wed, 29 Jul 2020 20:59:21 GMT

{"data":["out.csv"]}

    This will dump headers (-D) to stdout (-) (Look for --dump-header in man curl).

    IMHO also very handy in this context:

    I often use jq to get that json data (eg from some rest APIs) formatted. But as jq doesn't expect a HTTP header, the trick is to print headers to stderr using -D/dev/stderr. Note that this time we also use -sS (--silent, --show-errors) to suppress the progress meter (because we write to a pipe).

    $ curl -sSD/dev/stderr http://localhost:1231/foo | jq .
HTTP/1.1 200 OK
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/json
Date: Wed, 29 Jul 2020 21:08:22 GMT

{
  "data": [
    "out.csv"
  ]
}

    I guess this also can be handy if you'd like to print headers (for quick inspection) to console but redirect body to a file (eg when its some kind of binary to not mess up your terminal):

    $ curl -sSD/dev/stderr http://localhost:1231 > /dev/null
HTTP/1.1 200 OK
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/json
Date: Wed, 29 Jul 2020 21:20:02 GMT

    Be aware: This is NOT the same as curl -I <url>! As -I will perform a HEAD request and not a GET request (Look for --head in man curl. Yes: For most HTTP servers this will yield same result. But I know a lot of business applications which don't implement HEAD request at all ;-P

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  • 野的像风
    2020-12-04 08:46

    I use this command to print the status code without any other output. Additionally, it will only perform a HEAD request and follow the redirection (respectively -I and -L).

    curl -o -I -L -s -w "%{http_code}" http://localhost

    This makes it very easy to check the status code in a health script:

    sh -c '[ $(curl -o -I -L -s -w "%{http_code}" http://localhost) -eq 200 ]'
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