Merge pull request #24 from robinverduijn/JENKINS-50772-set-s3-content-type

JENKINS-50772: Enhance uploadFile so that it optionally sets a "Content-Type" header.

Author: oleg-nenashev

src/main/java/io/jenkins/plugins/httpclient/RobustHTTPClient.java

@@ -239,9 +239,22 @@ public static String sanitize(URL url) {
      * Upload a file to a URL.
      */
     public void uploadFile(File f, URL url, TaskListener listener) throws IOException, InterruptedException {
+        uploadFile(f, null, url, listener);
+    }
+
+    /**
+     * Upload a file to a URL with a specific content type.
+     *
+     * @param f the file to upload
+     * @param contentType the content type for the specified file
+     */
+    public void uploadFile(File f, String contentType, URL url, TaskListener listener) throws IOException, InterruptedException {
         connect("upload", "upload " + f + " to " + sanitize(url), client -> {
             HttpPut put = new HttpPut(url.toString());
             put.setEntity(new FileEntity(f));
+            if (contentType != null) {
+                put.setHeader("Content-Type", contentType);
+            }
             return client.execute(put);
         }, response -> {}, listener);
     }