public Builder setHost(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      host_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Output only. The host that the task is sent to.

The host is constructed from the domain name of the app associated with
the queue's project ID (for example &lt;app-id&gt;.appspot.com), and the
[service][google.cloud.tasks.v2.AppEngineRouting.service],
[version][google.cloud.tasks.v2.AppEngineRouting.version], and
[instance][google.cloud.tasks.v2.AppEngineRouting.instance]. Tasks which
were created using the App Engine SDK might have a custom domain name.

For more information, see
[How Requests are
Routed](https://cloud.google.com/appengine/docs/standard/python/how-requests-are-routed).
</pre>

<code>string host = 4;</code>

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