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Re: [RFE] Improve etag handling with --etag-compare-update
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From: Paul Gilmartin via curl-users <curl-users_at_lists.haxx.se>
Date: Mon, 28 Apr 2025 07:32:07 -0600
On 4/28/25 02:37, Daniel Stenberg via curl-users wrote:
> On Mon, 28 Apr 2025, Aleksei via curl-users wrote:
>
>> I'm trying to implement a "download only if updated on a remote
>> resource" functionality with a curl script using etags.
>>
>> Currently the etag file saved with --etag-save becomes useless after
>> a single update on a remote resource.
>
> I don't understand. Can you elaborate? If the remote resource is
> indeed updated, surely it should download again and update the etag file?
...
This sounds like a site I use which, improperly, returns no ETag in the
headers when Status is 304. In that case, --etag-save overwrites the
ETag file which "becomes useless." I've circumvented with a wrapper
script. I shall not submit an enhancement request for cURL to
accommodate any misbehaving site.
Date: Mon, 28 Apr 2025 07:32:07 -0600
On 4/28/25 02:37, Daniel Stenberg via curl-users wrote:
> On Mon, 28 Apr 2025, Aleksei via curl-users wrote:
>
>> I'm trying to implement a "download only if updated on a remote
>> resource" functionality with a curl script using etags.
>>
>> Currently the etag file saved with --etag-save becomes useless after
>> a single update on a remote resource.
>
> I don't understand. Can you elaborate? If the remote resource is
> indeed updated, surely it should download again and update the etag file?
...
This sounds like a site I use which, improperly, returns no ETag in the
headers when Status is 304. In that case, --etag-save overwrites the
ETag file which "becomes useless." I've circumvented with a wrapper
script. I shall not submit an enhancement request for cURL to
accommodate any misbehaving site.
-- gil -- Unsubscribe: https://lists.haxx.se/mailman/listinfo/curl-users Etiquette: https://curl.se/mail/etiquette.htmlReceived on 2025-04-28