default Optional getFirstHeader()

in functions-framework-api/src/main/java/com/google/cloud/functions/HttpMessage.java [107:113]

• 7 lines of code
• 3 McCabe index (conditional complexity)

  default Optional<String> getFirstHeader(String name) {
    List<String> headers = getHeaders().get(name);
    if (headers == null || headers.isEmpty()) {
      return Optional.empty();
    }
    return Optional.of(headers.get(0));
  }