Gzip decompression of http Response - node.js

Question

Using request module, I am trying to fetch response from a web service which has following header in the API request:
accept-encoding : gzip
and correspondingly, following header in the response :
content-encoding : gzip
When I am trying to decompress the response(get the correct readable response) using zlib(referred here), I am unable to do so.
Code Snippet :
var options = {
url: url,
qs: params.qparams,
method: params.method,
json: params.body,
headers: {
'api_key': configkey,
'Content-Type': 'application/json',
'Accept-Encoding': 'gzip'
},
timeout: constants.request_timeout
};
request(options, function(err, response, body) {
var encoding = response.headers['content-encoding']
if (encoding && encoding.indexOf('gzip') >= 0) {
zlib.gunzip(body, function(err, dezipped) {
//ERROR : { [Error: incorrect header check] errno: -3, code: 'Z_DATA_ERROR' }
var json_string = dezipped.toString('utf-8');
var json = JSON.parse(json_string);
console.log('\nJSON ::\n',json);
});
} else {
console.log('\n\nRESPONSE IS NOT GZIPPED!');
}
}
I am getting an error here(as commented in the code), using zlib.
I could not figure out as where is it going wrong, tried with multiple npm modules like unzipResponse and compress-buffer and tried different approaches as well as suggested at various places for handling gzip.
If someone can help out in resolving this, I'll be really thankful.

Answer 1

I have got a solution as need to add one more key to the options object as :
var options = {
url: url,
qs: params.qparams,
method: params.method,
json: params.body,
headers: {
'api_key': configkey,
'Content-Type': 'application/json',
'Accept-Encoding': 'gzip'
},
timeout: constants.request_timeout,
encoding: null
};
If someone has a better approach to perform the decompression, please add-on.