On 05/16/2014 01:45 PM, Tom Breton (Tehom) wrote:
> The RawHeader approach seems better, actually. Too bad QT doesn't offer a
> neat solution.
>
> Or we could just live with it. Now that we know what causes it - good
> work, BTW, Tim - we can be sure the consequences aren't too serious.
Since QNetworkAccessManager provides the header
"Accept-Encoding: gzip, deflate" by default, explicitly setting
QNetworkRequest::setRawHeader("Accept-Encoding", "gzip, deflate")
makes absolutely no difference in what is the server sees or in how
it responds. The headers in both cases are
Request:
GET /comp_005.rg HTTP/1.1
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
Accept-Language: en-US,*
User-Agent: Mozilla/5.0
Host: xxx.valhalla.local:80
Reply:
HTTP/1.1 200 OK
Date: Sat, 17 May 2014 11:02:17 GMT
Server: Sha-bang!
Last-Modified: Wed, 05 Mar 2014 15:06:40 GMT
ETag: "1ea9d2-3d06-53173d80"
Accept-Ranges: bytes
Content-Length: 15622
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/plain
Content-Encoding: gzip
However, without the explicit inclusion of the Accept-Encoding
header, the file is automatically decompressed on arrival.
Just for fun I also tried setting
QNetworkRequest::setRawHeader("Accept-Encoding", "whatever") with the
following result:
Request:
GET /comp_005.rg HTTP/1.1
Accept-Encoding: whatever
Connection: Keep-Alive
Accept-Language: en-US,*
User-Agent: Mozilla/5.0
Host: xxx.valhalla.local:80
Reply:
HTTP/1.1 200 OK
Date: Sat, 17 May 2014 11:30:23 GMT
Server: Sha-bang!
Last-Modified: Wed, 05 Mar 2014 15:06:40 GMT
ETag: "1ea9d2-3d06-53173d80"
Accept-Ranges: bytes
Content-Length: 15622
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/plain
Content-Encoding: x-gzip
The server came back with "Content-Encoding: x-gzip" instead of
"Content-Encoding: gzip," but the end result was the same: the file
was not decompressed. It would seem supplying any sort of
Accept-Encoding header is adequate to prevent QNetworkAccessManager
from doing its thing, but I have no way of verifying this in all
cases. It's probably OK, but I'm always apprehensive about relying
on undocumented behavior to make something work.
Tim Munro
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