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Message: #08251

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[EP-tech] Linkcheck: HEAD method ends up in 404

Hi out there

we're working on a linkchecker to remove all gone official and related links in our Repo. Some of the URLs return to our own Repo and lickchecker gets an ugly 404 although the publications exist.

So, what we're doing is some LWP::UserAgent  stuff, a simple get HEAD of the URL an then analyze the response. If there was a '$status_code == HTTP_METHOD_NOT_ALLOWED' we would try a GET and all together we're doing some delay/retry/timeout handling. But in the end we allways catch a 404 :-(

Additional information
- We use a 404 handler
- We're allowed to use Get, Put, Trace, Options - all fine, only HEAD method results in a 404 ?!?
- We use the redirect from https://www.zora.uzh.ch/1 => https://www.zora.uzh.ch/id/eprint/1/ and it only seems to concern this dynamic type of content; static pages work fine.

Let's show some examples via CURL:

[zora]$ curl -i -X HEAD -L "https://www.zora.uzh.ch/1" (https://www.zora.uzh.ch/1')
HTTP/1.1 303 See Other
Date: Tue, 14 Jul 2020 11:49:08 GMT
Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_perl/2.0.11 Perl/v5.16.3
Location: /id/eprint/1

HTTP/1.1 303 See Other
Date: Tue, 14 Jul 2020 11:49:13 GMT
Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_perl/2.0.11 Perl/v5.16.3
Allow: GET,HEAD,PUT,OPTIONS
Location: https://www.zora.uzh.ch/id/eprint/1/
Strict-Transport-Security: max-age=15780000

HTTP/1.1 404 Not Found
Date: Tue, 14 Jul 2020 11:49:18 GMT
Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_perl/2.0.11 Perl/v5.16.3
Cache-Control: no-store, no-cache, must-revalidate
Strict-Transport-Security: max-age=15780000
Content-Type: text/html; charset=utf-8



[zora]$ curl -i -X HEAD -L "https://www.zora.uzh.ch/" (https://www.zora.uzh.ch/')
HTTP/1.1 200 OK
Date: Tue, 14 Jul 2020 11:49:31 GMT
Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_perl/2.0.11 Perl/v5.16.3
Expires: Thu, 13 Aug 2020 11:49:31 GMT
Cache-Control: no-store, no-cache, must-revalidate
Vary: Accept-Encoding
Strict-Transport-Security: max-age=15780000
Content-Type: text/html; charset=utf-8



[zora]$ curl -i -X HEAD -L "https://www.zora.uzh.ch/help/" (https://www.zora.uzh.ch/help/')
HTTP/1.1 200 OK
Date: Tue, 14 Jul 2020 11:49:53 GMT
Server: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips mod_perl/2.0.11 Perl/v5.16.3
Expires: Thu, 13 Aug 2020 11:49:53 GMT
Cache-Control: no-store, no-cache, must-revalidate
Vary: Accept-Encoding
Strict-Transport-Security: max-age=15780000
Content-Type: text/html; charset=utf-8


Does anybody has any suggestion, solution, hint?

Kind gerads from Zürich
Martin & Jens