[Qgis-user] How make reading from protocol to use /vsicurl_streaming/ instead of /vsicurl/?

[Rahkonen Jukka (MML)]

Hi,

I have tried, but that does not work for me with QGIS 3.18. Opening the URL (with or without double quotes) as a file gives me just this:

Invalid Data Source: https://api.digitransit.fi/routing/v1/routers/hsl/isochrone?fromPlace=60.168,24.938&mode=WALK,TRANSIT&date=2019-11-01&time=08:00:00&maxWalkDistance=500&cutoffSec=1800&cutoffSec=3600 is not a valid or recognized data source.

-Jukka-

Lähettäjä: Even Rouault <even.rouault at spatialys.com>
Lähetetty: tiistai 21. syyskuuta 2021 13.56
Vastaanottaja: Rahkonen Jukka (MML) <jukka.rahkonen at maanmittauslaitos.fi>; qgis-user at lists.osgeo.org
Aihe: Re: [Qgis-user] How make reading from protocol to use /vsicurl_streaming/ instead of /vsicurl/?


Jukka,

Somewhat counter-intuitively, you can use "https://api.digitransit.fi/routing/v1/routers/hsl/isochrone?fromPlace=60.168,24.938&mode=WALK,TRANSIT&date=2019-11-01&time=08:00:00&maxWalkDistance=500&cutoffSec=1800&cutoffSec=3600" as a filename when using the File source type. This is due to GeoJSON driver having a particular logic when passed a http[s]:// filename to ingest it fully in memory.

Even
Le 21/09/2021 à 12:46, Rahkonen Jukka (MML) a écrit :
Hi,

This command gives a result with ogrinfo:

ogrinfo /vsicurl_streaming/"https://api.digitransit.fi/routing/v1/routers/hsl/isochrone?fromPlace=60.168,24.938&mode=WALK,TRANSIT&date=2019-11-01&time=08:00:00&maxWalkDistance=500&cutoffSec=1800&cutoffSec=3600"<https://api.digitransit.fi/routing/v1/routers/hsl/isochrone?fromPlace=60.168,24.938&mode=WALK,TRANSIT&date=2019-11-01&time=08:00:00&maxWalkDistance=500&cutoffSec=1800&cutoffSec=3600> -al

If I try to use the URI part with QGIS with Add layer - Vector - Protocol - HTTP/HTTPS/FTP then QGIS seems to add automatically /vsicurl/ into the service request. With this service /vsicurl/ does not work but /vsicurl_streaming/ works. It there any way to force QGIS to use the streaming mode?

The debugging tools do not seem to log the network traffic from the "read from protocol" requests. Is that a right observation?

-Jukka Rahkonen-



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