protected HttpHeaders copy(HttpHeaders headers){
		HttpHeaders newHeaders = new HttpHeaders();
		newHeaders.putAll(headers);
		return newHeaders;
	}
protected HttpHeaders copy ( HttpHeaders headers ) { HttpHeaders newHeaders = new HttpHeaders ( ) ; newHeaders . putAll ( headers ) ; return newHeaders ; }
Make a writable copy of an existing HttpHeaders
@param headers	existing HttpHeaders to be copied
@return	a new HttpHeaders that contains all the entries from the existing HttpHeaders