[MapServer-users] Multiple requests to s3 bucket to the same Tiff after GetMap request

[Scott]

That file appears to be a cloud optimized geotiff. If that's the case 
multiple gets is perfectly normal as it's possibly retrieving overviews.

I don't see a server return code, but if it's 206, everything is fine.

Additionally, you can open your dev tools in your browser (Ctrl+Shift+I) 
and watch how many bytes each request gets. With COG it should never be 
the whole file.

On 2/10/23 08:27, Marcin Niemyjski via MapServer-users wrote:
> Hello,
> I wasn't happy with the time it took for the GetMap request to complete, 
> so I decided to check apache's error logs. I realized that S3 Get 
> request is performed multiple times and I have no idea why.
> 
> Below you can see GET request which appears in log file of one request 5 
> times.
> 
> [Fri Feb 10 15:49:45.456184 2023] [cgi:error] [pid 1300229] [client 
> 127.0.0.1:37842] AH01215: > GET 
> /DIAS/Sentinel-1-COG/SAR/GRD-COG/2022/03/01/S1A_IW_GRDH_1SDV_20220301T045236_20220301T045301_042123_0504C2_3E5D_COG.SAFE/measurement/s1a-iw-grd-vh-20220301t045236-20220301t045301-042123-0504c2-002.tiff HTTP/1.1\r: /usr/lib/cgi-bin/mapserv
> 
> The way my mapfile gets source raster data:
> 
> TileIndex -> VRT -> COG with Ground Control Points (this is caused by GCP)
> 
> I would be grateful if you could check full log file -> 
> https://pastecode.io/s/xdyuay0f <https://pastecode.io/s/xdyuay0f>
> 
> Thanks,
> Marcin
> 
> 
> 
> 
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