Return relative Location header values in order to support HTTPS proxy servers

Author: tomdesair

src/main/java/me/desair/tus/server/creation/CreationPostRequestHandler.java

@@ -39,7 +39,8 @@ public void process(HttpMethod method, TusServletRequest servletRequest,
         info = uploadStorageService.create(info, ownerKey);
 
         //We've already validated that the current request URL matches our upload URL so we can safely use it.
-        String url = servletRequest.getRequestURL().append("/").append(info.getId()).toString();
+        String uploadURI = servletRequest.getRequestURI();
+        String url = uploadURI + (StringUtils.endsWith(uploadURI, "/") ? "" : "/") + info.getId();
         servletResponse.setHeader(HttpHeader.LOCATION, url);
         servletResponse.setStatus(HttpServletResponse.SC_CREATED);
 

src/test/java/me/desair/tus/server/creation/ITCreationExtension.java

@@ -31,7 +31,7 @@
 public class ITCreationExtension extends AbstractTusExtensionIntegrationTest {
 
     private static final String UPLOAD_URI = "/test/upload";
-    private static final String UPLOAD_URL = "http://localhost:80/test/upload/";
+    private static final String UPLOAD_URL = UPLOAD_URI + "/";
 
     private UUID id;