curl: (6) Could not resolve host: application

Question

Getting url: (6) Could not resolve host: application error after this command :

curl -i -H 'Content-Type: application/json' -d '{"Code":"FR","Name":"France"}' http://127.0.0.1:8080/countries

Full error log:

curl: (6) Could not resolve host: application
HTTP/1.1 415 Unsupported Media Type
Content-Type: application/json; charset=utf-8
X-Powered-By: go-json-rest
Date: Sat, 02 Apr 2016 05:31:20 GMT
Content-Length: 73

{
"Error": "Bad Content-Type or charset, expected 'application/json'"
}

What's wrong with this command?

Edit:

I solved my problem editing like this in windows : "{/"Code/":/"FR/"}"

kujiy · Accepted Answer · 2018-02-25T03:26:39.950

223

In my case, putting space after colon was wrong.

# Not work
curl -H Content-Type: application/json ~
# OK
curl -H Content-Type:application/json ~

edited Feb 25 '18 at 03:26

answered Oct 17 '16 at 05:14

kujiy

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This explains why none of my Surveymonkey API requests with json data were working. Thank you! – ChrisFNZ Oct 27 '20 at 03:18
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On Windows I was also able to fix it by using `"` instead of `'`. Not work: `curl -H 'Accept: application/json'`. Work: `curl -H "Accept: application/json"`. – serg06 Apr 02 '21 at 00:25
1

It seems like using `'`single quotes`'` on Windows just causes all kinds of problems which are difficult to diagnose because the errors often make no sense. Using `-v` should clear things up. – Christopher Schultz Feb 15 '22 at 15:48

LinuxDisciple · Answer 2 · 2016-04-01T17:05:59.060

21

It's treating the string application as your URL.
This means your shell isn't parsing the command correctly.
My guess is that you copied the string from somewhere, and that when you pasted it, you got some characters that looked like regular quotes, but weren't.
Try retyping the command; you'll only get valid characters from your keyboard. I bet you'll get a much different result from what looks like the same query. As this is probably a shell problem and not a 'curl' problem (you didn't build cURL yourself from source, did you?), it might be good to mention whether you're on Linux/Windows/etc.

edited Apr 01 '16 at 17:05

answered Apr 01 '16 at 17:00

LinuxDisciple

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Did you try retyping it yet? – LinuxDisciple Apr 01 '16 at 17:48
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I solved my problem. In windows I have to type like this : "{/"Code/":/"FR/"}" – Yeahia2508 Apr 01 '16 at 18:03
2

I had a similar problem. My command contained no double quotes, the argument was between single quotes. I replaced them with double quotes, it worked. On Windows as well. – LogicalKip Aug 19 '16 at 08:05

score 19 · Answer 3 · edited Aug 07 '19 at 10:06

19

I replaced all the single quotes ['] to double quotes ["] and then it worked perfectly. Thanks for the input by @LogicalKip.

edited Aug 07 '19 at 10:06

Dharman

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answered Aug 07 '19 at 09:08

zaffar

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I had a space after my colon and also I didn't use double quotes – DIRTY DAVE Oct 18 '21 at 04:43

score 15 · Answer 4 · answered Apr 21 '18 at 22:27

15

Example for Slack.... (use your own web address you generate there)...

curl -X POST -H "Content-type:application/json" --data "{\"text\":\"A New Program Has Just Been Posted!!!\"}" https://hooks.slack.com/services/T7M0PFD42/BAA6NK48Y/123123123123123

answered Apr 21 '18 at 22:27

Cyphire

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@pomply Could you please elaborate a bit more? Did you literally try the example above? What error message did you get? – ᴠɪɴᴄᴇɴᴛ Aug 09 '19 at 21:28

score 9 · Answer 5 · answered May 14 '19 at 19:26

9

I was getting this error too. I resolved it by installing: https://git-scm.com/

and running the command from the Git Bash window.

answered May 14 '19 at 19:26

heyitsmyusername

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score 6 · Answer 6 · answered Oct 18 '21 at 04:47

For my issue using curl on Windows 10 with the environment variable already setup,

curl -X POST -H "Content-Type:application/json" --data "{\"jsonrpc\":\"2.0\",\"method\":\"eth_blockNumber\",\"params\":[],\"id\":83}" https://some-node-url.com

I needed to replace all single quotes ' with double quotes "

even though the example for the blockchain I was trying to curl to had a single quote.

And also add \ in front of all the double quotes inside the param brackets {}

questionto42 · Answer 7 · 2020-08-19T11:08:12.677

In my case, it was a missing line break that added unneeded parameters due to a bad copy and paste.

I followed a guide at https://pytorch.org/docs/stable/notes/windows.html#include-optional-components which looks like this when you copy it right here without any editing:

REM Make sure you have 7z and curl installed.

REM Download MKL files

curl https://s3.amazonaws.com/ossci-windows/mkl_2020.0.166.7z -k -O 7z x -aoa mkl_2020.0.166.7z -omkl

Output:

C:\Users\Admin>curl "https://s3.amazonaws.com/ossci-windows/mkl_2020.0.166.7z" -k -O 7z x
-aoa mkl_2020.0.166.7z -omkl   
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed 
100  103M  100  103M  0     0  5063k      0  0:00:21  0:00:21 --:--:-- 5629k
0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0curl: (6) Could not resolve host: 7z
0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0curl: (6) Could not resolve host: x 
curl: (6) Could not resolve host: mkl_2020.0.166.7z

There is actually a line break before "7z", with "7z" as the executable (and before, in addition to adding curl to your user PATH, you need to add 7z to the user PATH as well, for example with setx PATH "%PATH%;C:\Program Files\7-Zip\"):

REM Download MKL files

curl https://s3.amazonaws.com/ossci-windows/mkl_2020.0.166.7z -k -O

7z x -aoa mkl_2020.0.166.7z -omkl

score 1 · Answer 8 · answered Sep 26 '20 at 08:16

In my case, I copied the curl command from Confluence to TextEdit. After spending almost an hour, and trying to paste the command in different text editors in order to sanitize, finally, PyCharm helped me (IntelliJ should help too)

After pasting it in PyCharm I got to see the error

After removing these "NBSP" (non-breaking spaces), the command started running fine.

score 1 · Answer 9 · answered Dec 12 '21 at 01:14

1

In ubuntu like system this mainly occurs when we don’t have nameservers in the /etc/resolv.conf

So, we added the following line in the file.

nameserver 8.8.8.8

Then, this fixed the error and the host started resolving.

answered Dec 12 '21 at 01:14

muhive

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in my rasperry pi I was able to solve the problem using your suggestion, however, the issue pops up frequently. This resolf.conf file frequently missing this line `nameserver 8.8.8.8` . Do you know how to solve the issue forever? – Arseniy Sleptsov Nov 03 '22 at 16:59

score 0 · Answer 10 · answered Jan 05 '21 at 19:59

0

Windows consoles usually doesnt interpret double quotes correctly in a JSON array, so you can solve it adding a slash / before double quotes.

answered Jan 05 '21 at 19:59

enrique-es

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curl: (6) Could not resolve host: application

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