HTTP Post Returning Different Results from HTTP Get

I am having trouble with an HTTP POST returning different results from

an equivalent HTTP GET. If you go to the following URL in a browser:

http://transit.511.org/tripplanner/itinresults.asp&fs=714+Montgomery+St

you will see that it displays a web page containing the following text:

"We found some location(s) similar to your origin entry, but no exact match."

I get that same result from my Java program if I use a GET request.

However, if I use an equivalent POST from my Java program, I do not

get the same result. Instead, I get a web page that contains (among

other content) the following text:

"Please enter a STARTING LOCATION to process your itinerary request."

I know for a fact that other programs (to which I do not have access, and

which are probably not written in Java) are successfully using a POST,

but mine isn't working. Why not?

Here is my code:

String actionURLString ="http://transit.511.org/tripplanner/itinresults.asp";

String content ="fs=714+Montgomery+St\\n\\r";

int length = content.length();

String contentLength = Integer.toString(length);

URL url =new URL(actionURLString);

URLConnection urlConnection = url.openConnection();

HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;

httpURLConnection.setRequestMethod("POST");

httpURLConnection.setDoInput(true);

httpURLConnection.setDoOutput(true);

httpURLConnection.setUseCaches(false);

httpURLConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

httpURLConnection.setRequestProperty("Content-Length", contentLength);

httpURLConnection.setRequestProperty("User-Agent","Mozilla/5.0 (compatible; Hello; http://www.hello.com)");

OutputStream outputStream = httpURLConnection.getOutputStream();

OutputStreamWriter writer =new OutputStreamWriter(outputStream);

writer.write(content);

writer.flush();

writer.close();

int responseCode = httpURLConnection.getResponseCode();

InputStream inputStream = httpURLConnection.getInputStream();

Reader inputStreamReader =new InputStreamReader(inputStream);

Reader reader =new BufferedReader(inputStreamReader);

StringBuffer stringBuffer =new StringBuffer();

int numCharactersRead;

do

{

char characters[] =newchar[1024];

numCharactersRead = reader.read(characters, 0, 1024);

if (numCharactersRead > 0)

stringBuffer.append(characters, 0, numCharactersRead);

}

while (numCharactersRead != -1);

String response = stringBuffer.toString();

reader.close();

inputStreamReader.close();

System.out.println(response);

[3609 byte] By [rcauvina] at [2007-11-27 9:05:40]