Sending a POST request with JSON data in Linux - linux

Question

I first work with Postman to test an api to do simple POST requests and everything worked fine as it is easy to add values in the body part.
Now I need to do the same from a Linux console. I tried using the curl command.
curl -X POST -H "Content-Type: application/json" -d'{"DeviceId":"L","TransactionValue":"360","RSSI":"360","Time":"2018-07-30T11:02:00"}' https://IPADDRESS.com.au
And other commands based on the curl but everytime I have this error log displayed on my Linux console :
(35) ssl_handshake returned - PolarSSL: (-0x7780) SSL - A fatal alert message was received from our peer
I don't understand why I have an issue on the Linux console and not on Postman and what is this issue.
Many thanks in advance.
Cheers!!

Answer 1

the problem is almost certainly with the backend ssl library, in your case, PolarSSL/mbedTLS, it seems your version is from 2014 or older.
which version of PolarSSL are you using? you can find out by running curl --version , what does it output?
try updating to the latest version of MbedTLS and re-compile curl, and try again, you can find the latest version here: https://tls.mbed.org/tech-updates/releases
(btw, seems PolarSSL and mbedTLS refers to the same thing, they just changed the name back in 2015. the fact that the error message refers to it as PolarSSL implies that you're using an old version from 2014 or or older)

Answer 2

Your command is right, the problem could be that you have an outdated curl / PolarSSL version since it seems to be working with postman.
Here is an example using curl 7.61.0 posting to httpbin.org:
$ curl -X POST https://httpbin.org/post -H "Content-type: application/json" -d '{"DeviceId":"L","TransactionValue":"360","RSSI":"360","Time":"2018-07-30T11:02:00"}'
{
"args": {},
"data": "{\"DeviceId\":\"L\",\"TransactionValue\":\"360\",\"RSSI\":\"360\",\"Time\":\"2018-07-30T11:02:00\"}",
"files": {},
"form": {},
"headers": {
"Accept": "*/*",
"Connection": "close",
"Content-Length": "83",
"Content-Type": "application/json",
"Host": "httpbin.org",
"User-Agent": "curl/7.43.0"
},
"json": {
"DeviceId": "L",
"RSSI": "360",
"Time": "2018-07-30T11:02:00",
"TransactionValue": "360"
},
"origin": "178.197.231.122",
"url": "https://httpbin.org/post"
}
If the previous example works, then try setting the host, for example:
$ curl -X POST https://IPADDRESS.com.au \
-H "Host: httpbin.org" \
-H "Content-type: application/json" \
-d '{"DeviceId":"L","TransactionValue":"360","RSSI":"360","Time":"2018-07-30T11:02:00"}'
Notice the -H "Host: httpbin.org" replace it with your own domain.