add CommonRequest.header

src/main/java/com/imyeyu/network/ProgressiveRequest.java

@@ -48,6 +48,21 @@ public class ProgressiveRequest extends FileRequest {
 		return this;
 	}
 
+	public ProgressiveRequest header(String key, String value) {
+		request.addHeader(key, value);
+		return this;
+	}
+
+	public ProgressiveRequest token(String token) {
+		request.addHeader("Token", token);
+		return this;
+	}
+
+	public ProgressiveRequest language(String langHeader) {
+		request.addHeader("Accept-Language", langHeader);
+		return this;
+	}
+
 	@Override
 	public void toFile(Path outputPath) throws IOException, NoPermissionException {
 		processResponse(request.execute(), IO.getOutputStream(outputPath.toFile()));