public int getHeadersCount() {
      return internalGetHeaders().getMap().size();
    }
<pre>
The relative URI.

The relative URI must begin with "/" and must be a valid HTTP relative URI.
It can contain a path and query string arguments.
If the relative URI 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_uri = 3;</code>

@param value The bytes for relativeUri to set.
@return This builder for chaining.
java-tasks/proto-google-cloud-tasks-v2/src/main/java/com/google/cloud/tasks/v2/AppEngineHttpRequest.java