private com.google.protobuf.MapField<java.lang.String, java.lang.String> internalGetLabels() {
      if (labels_ == null) {
        return com.google.protobuf.MapField.emptyMapField(LabelsDefaultEntryHolder.defaultEntry);
      }
      return labels_;
    }
<pre>
Optional. The format of the source text, for example, "text/html",
"text/plain". If left blank, the MIME type defaults to "text/html".
</pre>

<code>string mime_type = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The bytes for mimeType to set.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/DetectLanguageRequest.java