Using Jakarta HttpClient to mimic a POST network request

I try to mimic a network request send by a closed source application. The following is the network request snapshot captured from the closed source application : - Http: Request, POST /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage Command: POST - URI: /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage? Location: /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage ProtocolVersion: HTTP/1.1 - ContentType: application/x-www-form-urlencoded MediaType: application/x-www-form-urlencoded Cache-Control: no-cache Pragma: no-cache UserAgent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_06 Host: www.xxx.com:20000 Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2 Connection: keep-alive ContentLength: 164 HeaderEnd: CRLF - payload: HttpContentType = application/x-www-form-urlencoded [SORT]: 0,1,0,10,5,0,KL,0 [FIELD]: 33,38,51,58,68,88,78,98,99,101,56,57,69,70,71,72,89,90,91,92,59,60,61,62,79,80,81,82 [LIST]: 1155.KL,1295.KL,7191.KL,0097.KL,2267.KL I use httpclient to mimic the above request. /** * @param args the command line arguments */ public static void main(String[] args) { try { // TODO code application logic here HttpClient httpClient = new HttpClient(); httpClient.getParams().setParameter(HttpMethodParams.USER_AGENT, "Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_06"); PostMethod post = new PostMethod("http://www.xxx.com:20000/%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage?"); NameValuePair[] data = { new NameValuePair("SORT", "0,1,0,10,5,0,KL,0"), new NameValuePair("FIELD", "33,38,51,58,68,88,78,98,99,101,56,57,69,70,71,72,89,90,91,92,59,60,61,62,79,80,81,82"), new NameValuePair("LIST", "1155.KL,1295.KL,7191.KL,0097.KL,2267.KL") }; post.setRequestBody(data); httpClient.executeMethod(post); System.out.println(post.getResponseBodyAsString()); } catch (Exception exp) { exp.printStackTrace(); } } However, there are no respond from server side. I try to capture my own network request snapshot : - Http: Request, POST /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage Command: POST - URI: /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage Location: /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage ProtocolVersion: HTTP/1.1 UserAgent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_06 Host: www.xxx.com:20000 ContentLength: 234 - ContentType: application/x-www-form-urlencoded MediaType: application/x-www-form-urlencoded HeaderEnd: CRLF - payload: HttpContentType = application/x-www-form-urlencoded SORT: 0%2C1%2C0%2C10%2C5%2C0%2CKL%2C0 FIELD: 33%2C38%2C51%2C58%2C68%2C88%2C78%2C98%2C99%2C101%2C56%2C57%2C69%2C70%2C71%2C72%2C89%2C90%2C91%2C92%2C59%2C60%2C61%2C62%2C79%2C80%2C81%2C82 LIST: 1155.KL%2C1295.KL%2C7191.KL%2C0097.KL%2C2267.KL It seems that there are two major different : (1) URI (2) payload Is there anything I miss out in my httpclient code? After several experiment, I realize is that, httpclient perform URL encoding on my payload. It explicitly turns 1155.KL,1295.KL,7191.KL,0097.KL,2267.KL to 1155.KL%2C1295.KL%2C7191.KL%2C0097.KL%2C2267.KL To avoid this, I write a test code. The following test code works! try { Socket socket = new Socket("www.xxx.com", 20000); PrintWriter out = new PrintWriter(socket.getOutputStream(), true); final String body = "[SORT]=0,1,0,10,5,0,KL,0&[FIELD]=33,38,51,58,68,88,78,98,99,101,56,57,69,70,71,72,89,90,91,92,59,60,61,62,79,80,81,82&[LIST]=1155.KL,1295.KL,7191.KL,0097.KL,2267.KL"; final int length = body.length(); final String s = "POST /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage? HTTP/1.1\r\nContent-Type: application/x-www-form-urlencoded\r\nCache-Control: no-cache\r\nPragma: no-cache\r\nUser-Agent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_06\r\nHost: www.xxx.com:20000\r\nAccept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\nConnection: keep-alive\r\nContent-Length: "+length+"\r\n\r\n" + body; out.println(s); BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); while(true) { String ss = in.readLine(); if (ss == null) break; System.out.println(ss); } } catch (Exception exp) { } The following is the captured snap-shot : Frame: Number = 16, Captured Frame Length = 597, MediaType = ETHERNET + Ethernet: Etype = Internet IP (IPv4),DestinationAddress:[7C-04-20-00-01-00],SourceAddress:[01-00-01-00-00-00] + Ipv4: Src = 10.176.181.55, Dest = 202.75.55.23, Next Protocol = TCP, Packet ID = 956, Total IP Length = 583 + Tcp: Flags=...AP..., SrcPort=49253, DstPort=20000, PayloadLen=543, Seq=3920474750 - 3920475293, Ack=3537289604, Win=4380 (scale factor 0x2) = 17520 - Http: Request, POST /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage Command: POST + URI: /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage? ProtocolVersion: HTTP/1.1 + ContentType: application/x-www-form-urlencoded Cache-Control: no-cache Pragma: no-cache UserAgent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_06 Host: n2ntbfd03.asiaebroker.com:20000 Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2 Connection: keep-alive ContentLength: 164 HeaderEnd: CRLF - payload: HttpContentType = application/x-www-form-urlencoded [SORT]: 0,1,0,10,5,0,KL,0 [FIELD]: 33,38,51,58,68,88,78,98,99,101,56,57,69,70,71,72,89,90,91,92,59,60,61,62,79,80,81,82 [LIST]: 1155.KL,1295.KL,7191.KL,0097.KL,2267.KL
Can you capture the raw request? Maybe the lists that appear in your snapshot are posted like this: SORT=0&SORT=1&SORT=0... but the software you are using for capturing the request is doing some pretty printing of the lists.

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