HttpURLConnection conn.getRequestProperty return null

问题

I'm trying to push some data to an URL (MDS_CS) for a BES

when i set some Request Headers in my code, and submit the request, the submited request's header is set to null.

here is my code :

        HttpURLConnection conn =(HttpURLConnection)url.openConnection();
        conn.setDoInput(true);//For receiving the confirmation
        conn.setDoOutput(true);//For sending the data
        conn.setRequestMethod("POST");//Post the data to the proxy
        conn.setRequestProperty("X-Rim-Push-ID", pushId);
        conn.setRequestProperty("Content-Type", "text/html");
        conn.setRequestProperty("X-Rim-Push-Title", "-message");
        conn.setRequestProperty("X-Rim-Push-Type", "browser-message");                 
        conn.setRequestProperty("X-Rim-Push-Dest-Port", "7874");            
        //Write the data
        OutputStream out = conn.getOutputStream();
        out.write(data.getBytes());
        out.close();

        System.out.println(conn.getHeaderField("X-Rim-Push-ID"));

the last line return null when i try to retrieve the X-Rim-Push-Title it is NULL only X-Rim-Push-ID which is correctly retrieved,

please help me

回答1:

Not quite sure what you really want to do. But to see what is posted to the server you would have to post it to your own and read the data you receive there.

If you want to see all the REQUEST headers you could:

for (String header : conn.getRequestProperties().keySet()) {
   if (header != null) {
     for (String value : conn.getRequestProperties().get(header)) {
        System.out.println(header + ":" + value);
      }
   }
}

Or after connecting you can print out the RESPONSE headers:

for (String header : conn.getHeaderFields().keySet()) {
   if (header != null) {
     for (String value : conn.getHeaderFields().get(header)) {
        System.out.println(header + ":" + value);
      }
   }
}

回答2:

I would suggest using Apache HttpClient

final HttpClient client = new HttpClient();
final PostMethod method = new PostMethod(uri);
method.addRequestHeader("X-Rim-Push-Title", "-message");
client.executeMethod(method);
String responseBody = method.getResponseBodyAsString();
Header[] headers = method.getResponseHeaders();

HttpClient is a much more powerful way of dealing with HTTP than HttpURLConnection.

回答3:

When I check my headers submitted and the inputstream of request, I get the 200 ok status, but nothing is sent to device

from server: 200 | OK


=======REQUEST===============
request header:X-Rim-Push-ID:pushID:1342694818991
request header:Host:win-uhgr7vs88uz.assabb.com:8080
request header:Content-Length:19
request header:X-Rim-Push-Title:-message
request header:User-Agent:Java/1.6.0_18
request header:POST /push?DESTINATION=bestest%40assa-associates.com&PORT=7874&REQUESTURI=/ HTTP/1.1:null
request header:Content-Type:text/html
request header:Accept:text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
request header:Connection:keep-alive
request header:X-Rim-Push-Dest-Port:7874
request header:X-Rim-Push-Type:browser-message
======Response===============
response header:Date:Thu, 19 Jul 2012 10:47:10 GMT
response header:Content-Length:0
response header:X-RIM-Push-ID:pushID:1342694818991
response header:Via:MDS_5.0.3.26
response header:x-rim-multidest-push-supported:true
response header:Server:Apache-Coyote/1.1
response header:x-rim-push-persisted:fals

来源：https://stackoverflow.com/questions/11544256/httpurlconnection-conn-getrequestproperty-return-null

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java

http

web

httpurlconnection