public static Mono<DataBuffer> fixBodyMessage(final ServerHttpResponse response,
                                                  final CachedBodyOutputMessage outputMessage) {
        fixHeaders(response.getHeaders());
        return DataBufferUtils.join(outputMessage.getBody());
    }
fix the body message.

@param response      current response
@param outputMessage cache message
@return fixed body message
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/utils/ResponseUtils.java