public Builder mergeHttpBody(com.google.api.HttpBody value) {
      if (httpBodyBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && httpBody_ != null
            && httpBody_ != com.google.api.HttpBody.getDefaultInstance()) {
          getHttpBodyBuilder().mergeFrom(value);
        } else {
          httpBody_ = value;
        }
      } else {
        httpBodyBuilder_.mergeFrom(value);
      }
      if (httpBody_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
The prediction input. Supports HTTP headers and arbitrary data payload.
</pre>

<code>.google.api.HttpBody http_body = 2;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/StreamRawPredictRequest.java