Add a hook after connection is established

build.gradle

@@ -21,12 +21,12 @@ dependencies {
 }
 
 task sourcesJar(type: Jar, dependsOn: classes) {
-    classifier = 'sources'
+    archiveClassifier.set("sources")
     from sourceSets.main.allSource
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier.set("javadoc")
     from javadoc.destinationDir
 }
 

src/main/java/io/tus/java/client/TusClient.java

@@ -156,6 +156,8 @@ public TusUploader createUpload(@NotNull TusUpload upload) throws ProtocolExcept
             throw new ProtocolException("missing upload URL in response for creating upload", connection);
         }
 
+        onConnectionOpened(connection);
+
         // The upload URL must be relative to the URL of the request by which is was returned,
         // not the upload creation URL. In most cases, there is no difference between those two
         // but there may be cases in which the POST request is redirected.
@@ -168,6 +170,13 @@ public TusUploader createUpload(@NotNull TusUpload upload) throws ProtocolExcept
         return new TusUploader(this, uploadURL, upload.getTusInputStream(), 0);
     }
 
+    /**
+     * Hook for subclasses to do any post-open tasks
+     *
+     * @param urlConnection
+     */
+    protected void onConnectionOpened(HttpURLConnection urlConnection) {}
+
     /**
      * Try to resume an already started upload. Before call this function, resuming must be
      * enabled using {@link #enableResuming(TusURLStore)}. This method will look up the URL for this
@@ -212,6 +221,8 @@ public TusUploader resumeUpload(@NotNull TusUpload upload) throws FingerprintNot
         }
         long offset = Long.parseLong(offsetStr);
 
+        onConnectionOpened(connection);
+
         return new TusUploader(this, uploadURL, upload.getTusInputStream(), offset);
     }