On 01/25/2016 10:28 AM, Gilles Bardouillet wrote: > I'm using SQUID with CAS ICAP Server but I have one issue : > > * for some images, squid receive icap error as ICAP_ERR_OTHER It may be useful to know more details about that ICAP error. What ICAP response, if any, does Squid receive when it generates ICAP_ERR_OTHER? > * I noticed that for all these errors, Squid dont send the HTTP header > Allows 204 Allow:204 is not an HTTP header field. It is an ICAP header field. > * I read the code and find the Allow 204 header _is only set when > preview is enabled_. Are you sure? Several factors affect ICAP Allow:204 request header presence. Preview availability should not be one of them because Allow:204 is about 204 responses _outside_ of Preview. See RFC 3507 Section 4.6. > My icap conf activated preview and preview size as follow : > icap_preview_enable on > icap_preview_size 1024 IIRC, Squid ignores icap_preview_size in squid.conf (a bug). The ICAP service OPTIONS response determines the Preview size (subject to an internal limit of 64KB). > I read that the preview size value can be overwritten by OPTIONS > requests, so can give me some details, hints in order to find why some > pictures dont offer preview and then fails ? See RFC 3507 Section 4.5 for details on how Preview is negotiated. If you think Squid violates the ICAP protocol, please file a bug report with the corresponding capture of ICAP messages (from and to Squid). As for ICAP 204 outside of Preview, I believe Squid can offer to support that ICAP response if all of the checks below are successful: * the origin server OPTIONS response includes Allow:204; * the message content length is known at the ICAP request time; and * the message content length does not exceed 64KB. If you prefer to analyze the code, see Adaptation::Icap::ModXact::shouldAllow204() and Adaptation::Icap::ModXact::canBackupEverything(). HTH, Alex. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
