public com.google.protobuf.ByteString getRelativeUrlBytes() {
      java.lang.Object ref = relativeUrl_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        relativeUrl_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
The relative URL.

The relative URL must begin with "/" and must be a valid HTTP relative URL.
It can contain a path and query string arguments.
If the relative URL is empty, then the root path "/" will be used.
No spaces are allowed, and the maximum length allowed is 2083 characters.
</pre>

<code>string relative_url = 3;</code>

@return The bytes for relativeUrl.
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/AppEngineHttpRequest.java