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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Have you tried with configuration option “CPL_VSIL_CURL_USE_HEAD=[YES/NO]: Defaults to YES. Controls whether to use a HEAD request when opening a remote URL.”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Lähettäjä:</b> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>Puolesta </b>Daniel Evans via gdal-dev<br>
<b>Lähetetty:</b> tiistai 10. syyskuuta 2024 16.57<br>
<b>Vastaanottaja:</b> 'gdal-dev@lists.osgeo.org' (gdal-dev@lists.osgeo.org) <gdal-dev@lists.osgeo.org><br>
<b>Aihe:</b> [gdal-dev] Ignore content-length in vsicurl?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am attempting to read a dataset via /vsicurl/ where I believe the server is incorrectly returning `content-length: 0` in response to HEAD requests. This causes GDAL to believe it's a zero-length file, and it therefore can't be read.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If I download the file via HTTP GET, it's valid, and GDAL can read it locally. I've also confirmed I can use /vsicurl/ on some test datasets in the GDAL repo.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is it possible to force GDAL to work around the faulty content-length header, or is it too fundamental a problem to ignore?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've separately got in touch with the data provider to see if they are able to fix the issue at their end.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Daniel<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">URL of the troublesome dataset:<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://data.source.coop/earthgenome/sentinel2-temporal-mosaics/20NMH_2024-04-01_2024-08-01/B08.tif">https://data.source.coop/earthgenome/sentinel2-temporal-mosaics/20NMH_2024-04-01_2024-08-01/B08.tif</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Example HTTP header responses I'm seeing:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">GET<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">HTTP/2 200<br>
date: Tue, 10 Sep 2024 13:47:54 GMT<br>
content-type: binary/octet-stream<br>
content-length: 278198294<br>
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers<br>
etag: "a79f3f685281d6681e4d362536c5b3eb-34"<br>
last-modified: Thu, 25 Jul 2024 13:16:08 GMT<br>
x-version: 0.0.16<br>
access-control-allow-credentials: true<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">HEAD<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">HTTP/2 200<br>
date: Tue, 10 Sep 2024 13:48:08 GMT<br>
content-type: binary/octet-stream<br>
content-length: 0<br>
x-version: 0.0.16<br>
access-control-allow-credentials: true<br>
etag: "a79f3f685281d6681e4d362536c5b3eb-34"<br>
last-modified: Thu, 25 Jul 2024 13:16:08 GMT<br>
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers<o:p></o:p></p>
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