Cannot POST with proper json headers with libcurl 7.82.0

[bduggan]

Hi Curt,

It doesn't seem possible to send both Accept: application/json and Content-Type: application/json using LibCurl with version 7.82.0 of the library. This may be an issue with libcurl, not sure. Here are a couple of the things I've tried:

use LibCurl::HTTP :subs;
say jpost('https://httpbin.org/post', %(Content-Type => 'application/json', Accept => 'application/json'));
# sends "Accept => */*"
say jpost('https://httpbin.org/post', %(Content-Type => 'application/json', Accept => 'application/json'), :x<z>);
# sends "Content-Type => application/x-www-form-urlencoded"
my $curl = LibCurl::Easy.new(URL => 'http://httpbin.org/post');
$curl.setopt(post => 1);
$curl.set-header(Accept => 'application/json');
$curl.set-header(Content-Type => 'application/json');
say $curl.perform.content;
# sends "Accept": "*/*",

For the last one -- changing the order of calling set-header seems to make a difference:

my $curl = LibCurl::Easy.new(URL => 'http://httpbin.org/post');
$curl.setopt(post => 1);
$curl.set-header(Content-Type => 'application/json');
$curl.set-header(Accept => 'application/json');
say $curl.perform.content;
# Sends "Content-Type": "application/x-www-form-urlencoded"

Not sure if there is some other order of calling these methods that will work -- as far as I can tell, it's impossible to set both the Accept and the Content-Type header to application/json for a POST request.

Brian

[meowmeowarmy]

I'm having the same issue. It only seems to send 1 of the headers when you have more than 1.

libcurl4 - 7.81.0
Ubuntu 22.04 LTS
Rakudo Star - v2022.07