How to call a URL with multipart request on server side where instead of file there is a string containing file contents

I have a xml file content as string in my servlet, I need to call another URL with multipart post request to upload it as xml file. Is there a way it can be done? So far this is what i am doing ``` private def createConfiguration(def sessiontoken) { /*reqParams is request.getParameterMap(), fileParams is again a map*/ def charset = "UTF-8"; def query = String.format("emailaddress=%s&projectid=%s&cfgname=%s&cfgdesc=%s&cfgfile=%s", URLEncoder.encode(sessiontoken, charset), URLEncoder.encode(reqParams.c_Cfgname[0], charset), URLEncoder.encode(reqParams.c_Cfgdesc[0], charset), URLEncoder.encode(reqParams.c_Cfgtype[0], charset), URLEncoder.encode(reqParams.CFGFILE[0], charset),) URLConnection connection = new URL(fileParams.login).openConnection() connection.setDoOutput(true) connection.setRequestProperty("Accept-Charset", charset) connection.setRequestProperty("Content-Type", "multipart/form-data;charset=" + charset) try { connection.getOutputStream().write(query.getBytes(charset)) } finally { connection.getOutputStream().close() } InputStream response = connection.getInputStream() def xmlString=response.getText() xmlString } ``` Below is the exception fetched SEVERE: Servlet.service() for servlet RedirectRequest threw exception java.io.IOException: Server returned HTTP response code: 800 for URL: `http://abhishek157:10070/project/create.action` at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$getInputStream.call(Unknown Source) . . Update Got this very usefull link by BalusC So I used it. ``` private def getStreamFromString(str) { // convert String into InputStream InputStream is = new ByteArrayInputStream(str.getBytes()) is } private def createConfiguration(def sessiontoken) { println "ok good $sessiontoken" def charset = "UTF-8" def boundary = Long.toHexString(System.currentTimeMillis()) def CRLF = "\r\n" String param = "value" URLConnection connection = new URL(fileParams.create).openConnection() println fileParams.create connection.setDoOutput(true) connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary); PrintWriter writer = null try { OutputStream output = connection.getOutputStream() writer = new PrintWriter(new OutputStreamWriter(output, charset), true) // Sending normal param. writer.append("--" + boundary).append(CRLF) writer.append("Content-Disposition: form-data; name=\"sessiontoken\"$CRLF$CRLF$sessiontoken").append(CRLF) //writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF) writer.append(CRLF) writer.append(param).append(CRLF).flush() writer.append("--" + boundary).append(CRLF) writer.append("Content-Disposition: form-data; name=\"cfgname\"$CRLF$CRLF${reqParams.c_Cfgname[0]}").append(CRLF) //writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF) writer.append(CRLF) writer.append(param).append(CRLF).flush() writer.append("--" + boundary).append(CRLF) writer.append("Content-Disposition: form-data; name=\"cfgdesc\"$CRLF$CRLF${reqParams.c_Cfgdesc[0]}").append(CRLF) //writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF) writer.append(CRLF) writer.append(param).append(CRLF).flush() writer.append("--" + boundary).append(CRLF) writer.append("Content-Disposition: form-data; name=\"cfgenv\"$CRLF$CRLF${reqParams.c_Cfgtype[0]}").append(CRLF) //writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF) writer.append(CRLF) writer.append(param).append(CRLF).flush() // Sending xml file. writer.append("--" + boundary).append(CRLF) writer.append("Content-Disposition: form-data; name=\"cfgfile\"; filename=\"" + reqParams.FILENAME[0] + "\"").append(CRLF) writer.append("Content-Type: text/xml; charset=" + charset).append(CRLF) writer.append(CRLF).flush() BufferedReader reader = null try { reader = new BufferedReader(new InputStreamReader(getStreamFromString(reqParams.CFGFILE[0]), charset)) for (String line; (line = reader.readLine()) != null;) { writer.append(line).append(CRLF) } } catch(Exception e) { e.printStackTrace() } finally { if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {} } writer.flush(); writer.append("--" + boundary + "--").append(CRLF) } finally { if (writer != null) writer.close(); } InputStream response = connection.getInputStream() def xmlString=response.getText() xmlString } ``` and on the console I get http://abhishek157:10070/project/create.action done but it is not at all hitting `http://abhishek157:10070/project/create.action` Any help? More Updates The real request (working from html form, where I select file from web browser) ``` -----------------------------7dcf4d30e8a Content-Disposition: form-data; name="sessiontoken" 4611685684744086913 -----------------------------7dcf4d30e8a Content-Disposition: form-data; name="cfgname" sadf -----------------------------7dcf4d30e8a Content-Disposition: form-data; name="cfgdesc" sadf -----------------------------7dcf4d30e8a Content-Disposition: form-data; name="cfgenv" Production -----------------------------7dcf4d30e8a Content-Disposition: form-data; name="cfgfile"; filename="C:\Simon\xmls\agentind.xml" Content-Type: text/xml <?xml version="1.0" encoding="UTF-8"?> and so on... ``` Updated params part after matching from the actual request in fiddler. See `createConfiguration` function Exception fetched (while calling `create.action` from servlet) Note: I checked in the servlet before sending the params in `create.action`, all are valid ``` java.lang.NumberFormatException: null ``` None of the params are read in the server, all are coming as `null`. Where is the problem. Please help.