[gdal-dev] OAPIF with Accept-encoding: gzip

[Even Rouault]

Hi Jukka,

Accept-Encoding: gzip is actually sent by default as you can see with 
"ogrinfo 
OAPIF:"https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/collections/building/" 
--debug on --config CPL_CURL_VERBOSE YES", and the server honors it:

[...]

> GET 
/inspire-buildings/features/v1/collections/building/items?f=json&limit=10 
HTTP/1.1
Host: beta-paikkatieto.maanmittauslaitos.fi
Accept-Encoding: gzip
Accept: application/geo+json, application/json

< HTTP/1.1 200 OK
[...]
< Content-Encoding: gzip
< Content-Type: application/geo+json

Curl automatically uncompress the data, so this is transparent for GDAL.

The debug trace "HTTP: These HTTP headers were set" is a bit misleading 
as it only displays the HEADERS option sent to CPLHttpFetch(), but not 
the content of what is specified with the GDAL_HTTP_HEADER_FILE config 
option. Enabling Curl traces with CPL_CURL_VERBOSE=YES is the ultimate 
way of seeing what is really sent to the server.

Even


Le 23/03/2021 à 13:21, Rahkonen Jukka (MML) a écrit :
>
> Hi,
>
> Is it possible to ask the OAPIF server to send response as gzipped, 
> and if it succeeds, would GDAL know what to do with the response? I 
> made a try by saving a line “Accept-Encoding: gzip" as a test file and 
> then making this request:
>
> ogrinfo 
> OAPIF:"https://beta-paikkatieto.maanmittauslaitos.fi/inspire-buildings/features/v1/collections/building/" 
> --config GDAL_HTTP_HEADER_FILE headers.txt --debug on --config 
> cpl_debug on
>
> Unfortunately it seems that Accept-Encoding header was not added:
>
> HTTP: These HTTP headers were set: Accept: application/geo+json, 
> application/json
>
> Is there some trick to make this to work or would it require changes 
> into the OAPIF driver?
>
> -Jukka Rahkonen-
>
>
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> gdal-dev at lists.osgeo.org
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