I create a normal HttpURLConnection-object. I set for example 3 request headers.
HttpURLConnection conn = (HttpURLConnection) someURL.openConnection();
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("User-Agent", "some_agent");
conn.setRequestProperty("Content-Type", "some_content-type");
conn.setRequestProperty("Content-Length", "some_content-length");
I look at setted request headers.
System.out.println(conn.getRequestProperties());
The header "Content-Length" is never contained in the result.
{User-Agent=[some_agent], Content-Type=[some_content-type]}
I am getting also null
if I call conn.getRequestProperty("Content-Length")
.
The code works fine but why does "Content-Length" disappear?
You can't set the content length; it's done automatically. You can, however, use setFixedLengthStreamingMode()
, when the content length is known in advance.
You need to set up System.setProperty("sun.net.http.allowRestrictedHeaders", "true");
More details about it(similar issue): https://community.oracle.com/thread/1999694?tstart=0
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