public Builder clearHeader() {
        bitField0_ = (bitField0_ & ~0x00000001);
        header_ = null;
        if (headerBuilder_ != null) {
          headerBuilder_.dispose();
          headerBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
header embodying a key and a value.
</pre>

<code>.google.cloud.tasks.v2beta2.HttpTarget.Header header = 1;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/HttpTarget.java