code: public static void replaceHeader(Map<String, String> headers, String name, String value) {
  		removeHeader(headers, name);
  		headers.put(name, value);
  	}
docs: Replace header field {@code name} value with {@code value}, or
  add it if {@code headers} does not have {@code name}.
  @param headers header fields
  @param name header field name
  @param value new value for the header field