Deflating POCO HttpResponse with gzip cuts the content - c++

Question

I am using POCO 1.7.8 to write a HTTP server. Problem is when using gzip for deflating the response data:
std::string content = "HELLO WORLD, THIS IS LONGISH STRING THAT IS CUT";
response->set("Content-Encoding", "gzip");
std::ostream& responseStream = response->send();
Poco::DeflatingOutputStream deflater(responseStream, Poco::DeflatingStreamBuf::STREAM_GZIP);
deflater << content;
deflater.close();
Response for the client is:
HELLO WORLD, THIS IS LONGISH STRING
Response headers:
Access-Control-Allow-Headers: origin, x-csrftoken, content-type, accept
Access-Control-Allow-Methods:POST, GET, OPTIONS
Access-Control-Allow-Origin: *
Access-Control-Max-Age: 86400
Connection: Close
Content-Encoding: gzip
Content-Language: en
Content-Length: 45
Content-Type: text/plain
Date: Tue, 09 Jan 2018 07:52:17 GMT
If I change this to use ZLIB and set the Content-Encoding to deflate, the whole response is correctly returned from the server:
std::string content = "HELLO WORLD, THIS IS LONGISH STRING THAT IS CUT";
response->set("Content-Encoding", "deflate");
std::ostream& responseStream = response->send();
Poco::DeflatingOutputStream deflater(responseStream, Poco::DeflatingStreamBuf::STREAM_ZLIB);
deflater << content;
deflater.close();
Response for the client is:
HELLO WORLD, THIS IS LONGISH STRING THAT IS CUT
Response headers:
Access-Control-Allow-Headers: origin, x-csrftoken, content-type, accept
Access-Control-Allow-Methods: POST, GET, OPTIONS
Access-Control-Allow-Origin: *
Access-Control-Max-Age: 86400
Connection: Close
Content-Encoding: deflate
Content-Language: en
Content-Length: 45
Content-Type: text/plain
Date: Tue, 09 Jan 2018 08:07:36 GMT
I tried to find examples how this should be done in the POCO server but couldn't find any and I am a bit stuck now with this. Any help is appreciated!

Answer 1

Are you sure you're setting the Content-Length header correctly for your compressed response? Alternatively try enabling chunked transfer encoding before calling send().
response->setChunkedTransferEncoding(true);