Attachment not downloading, though the response contains the data with right response header

Here is the request and response headers:

Request URL:https://localhost/createPPT/:
Request Method:POST
Status Code:200 OK

Response Headers
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Accept-Ranges:bytes
Cache-Control:no-cache, private, must-revalidate, max-stale=0, post-check=0, pre-check=0
Connection:keep-alive
Content-Disposition:attachment; filename="ExportedProjects.zip"
Content-Length:155646
Content-Type:application/zip
Date:Thu, 06 Aug 2015 12:50:11 GMT
ETag:W/"25ffe-471499980"
Last-Modified:Thu, 06 Aug 2015 12:50:11 GMT
Vary:X-HTTP-Method-Override
X-Content-Type-Options:nosniff
X-Download-Options:noopen
X-Frame-Options:SAMEORIGIN
X-XSS-Protection:1; mode=block

Request Headers
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Accept:application/json, text/plain, */*
Accept-Encoding:gzip, deflate
Accept-Language:en-US,en;q=0.8
Connection:keep-alive
Content-Length:28
Content-Type:application/json;charset=UTF-8
Cookie:connect.sid=s%3AK5ypKXysxzu1zSHsAmg1sLpsuTZ7aUjY.8z%2FnR1cfCzo9FgnCh8tUIOCijtrUwigT%2BwyYSSaVieU; loggedin_User=%22admin%22; garlid=%22556e8ebb658149350bcd96b1%22; max_priority=1
Host:localhost
Origin:https://localhost
Referer:https://localhost/
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.125 Safari/537.36

Request Payload
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["55af65cab610b5e8267d47d3"]

I am using MEAN stack and using response.download() function for downloading the attachment. The request is getting fulfilled, that is I am able to get the response and the response contains the data too but it is not downloading. It would be appreciable, if anyone can help me with this problem.