I just looked at your code again, and I find it a very weird approach to (re)set $ua->default_header for each request. The more traditional way would be to simply construct the appropriate HTTP::Request objects instead. At least from my spurious attempts, it does not feel as if a POST request uses the ->default_header:

> perl -MLWP::UserAgent -e "$ua=LWP::UserAgent->new();$ua->default_hea
+der('Content-type'    => 'application/json;odata=verbose'); 
    $ua->add_handler('request_send',sub{shift->dump;return});
    $ua->post('http://localhost:1234',{foo => bar})"
POST http://localhost:1234
User-Agent: libwww-perl/6.04
Content-Length: 7
Content-Type: application/x-www-form-urlencoded

foo=bar
[download]

Explicitly creating the HTTP::Request and then sending that one seems to create headers that I expect:

>perl -MLWP::UserAgent -MHTTP::Request::Common -e "$ua=LWP::UserAgent-
+>new(); 
    req= POST 'http://localhost:1234', 'Content-type'    => 'applicati
+on/json;odata=verbose', Content => { foo => 'bar' }; 
    $ua->add_handler('request_send',sub{shift->dump;return}); $ua->req
+uest($req)"
POST http://localhost:1234
User-Agent: libwww-perl/6.04
Content-Length: 7
Content-Type: application/json;odata=verbose

foo=bar
[download]

So I suggest you do more debugging on whether the values you think you are sending actually get send, and you also switch to the more common and accepted use of ->default_header() of setting only default headers and not per-request specific headers.

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