I try to upload multiple files, using Apache Http library.
compile group: 'org.apache.httpcomponents', name: 'httpmime', version: '4.5.6'
This is how I upload files.
String url = "url";
File f1 = new File("file1");
File f2 = new File("file2");
HttpPost request = new HttpPost(url);
request.addHeader("Content-Type", "multipart/form-data");
request.addHeader("Authorization", "Basic abcd=");
MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
FileBody fileBody1 = new FileBody(f1, ContentType.DEFAULT_TEXT);
FileBody fileBody2 = new FileBody(f2, ContentType.DEFAULT_TEXT);
multipartEntityBuilder.addPart("file_1_param", fileBody1);
multipartEntityBuilder.addPart("file_2_param", fileBody2);
HttpEntity httpEntity = multipartEntityBuilder.build();
request.setEntity(httpEntity);
HttpClient httpClient = HttpClients.createDefault();
HttpResponse response = httpClient.execute(request);
HttpEntity entity = response.getEntity();
if (entity == null) {
return;
}
InputStream is = entity.getContent();
String textResponse = InputStreamUtils.readText(is);
System.out.println(textResponse);
It prints.
<pre> Server Error</pre></p><h3>Caused by:</h3><pre>java.lang.RuntimeException: javax.servlet.ServletException: org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.io.IOException: Missing initial multi part boundary
at com.ca.devtest.acl.servlet.filters.RemoteAuthenticationFilter.doFilter(RemoteAuthenticationFilter.java:285)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1676)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
It works if I upload only one file though!
Note, this is not a duplicate. These links show posts which refer the problem on the server side. This problem is with the client side.
Jetty throws "Missing content for multipart request" on multipart form request
I found out a resolution. I wanted to share it with other people, so you can 1) learn how to upload files and 2) pay attention to HTTP headers.
When I append FileBody to MultipartEntityBuilder it automatically sets boundary. I simply removed this line from the code
request.addHeader("Content-Type", "multipart/form-data"); //Remove it