http://qs1969.pair.com?node_id=11148205

BernieC has asked for the wisdom of the Perl Monks concerning the following question:

I know this is a dumb question but I'm lost in a maze of twisty passages going back and forth between LWP::UserAgent and HTTP::Request::Common. I have a very simple question. I need to send a POST with the body being JSON data and I understand {I think} that to make that play nice with the server I should have a "content-type: application/json" header ... it should be trivial but I can't figure out where to stick that information in the $ua->POST() call. I must be missing something obvious.

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Re: content type in LWP::UserAgent
by choroba (Cardinal) on Nov 16, 2022 at 23:51 UTC
    According to the documentation, this should work (and if I understand the output, it really does). 
    #!/usr/bin/perl
use warnings;
use strict;

use LWP::UserAgent;
use Cpanel::JSON::XS qw{ encode_json };

my $ua = 'LWP::UserAgent'->new(timeout => 1);
my $response = $ua->post('https://httpbin.org/post',
                         'content-type' => 'application/json',
                         Content => encode_json({key => 'value'}));

print $response->decoded_content;

    [download]

    map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
[reply]
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[select]

      I can unequivocally say that what choroba has there works properly. Here's an actual working example I just tested (with some name/data modifications):

      use warnings;
use strict;

use LWP::UserAgent;
use JSON;

my $ua = LWP::UserAgent->new;

my $body_content = {
    token => 'NTE2M2Q3YmFmMGEzNjEzMGQyZmFmYmViNGEasdfmNzkzMTE3NzI3MWMz
+MDhkZjliYWE3NTI1OTg1MDQwNjNlZg'
};

my $resp = $ua->post(
    'https://my.server.com',
    'Content-Type'    => 'application/json',
    'Content'         => encode_json $body_content
);

print $resp->decoded_content;

      [download]
[reply]
[d/l]

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