Build info for Conan packages doesn't work in Artifactory SaaS. The problem is that Conan client is sending headers that contain periods and the NGINX reverse proxy blocks them.
Allow all headers in NGINX configuration, but it is considered a security risk by the NGINX team and it is not recommended (https://trac.nginx.org/nginx/ticket/629 and http://mailman.nginx.org/pipermail/nginx/2010-January/018271.html)
Use matrix parameters to set the build info properties for Conan artifacts. These parameters are documented here (https://www.jfrog.com/confluence/display/RTF4X/Using+Properties+in+Deployment+and+Resolution) and they are already used for other repositories.
These parameters in the URL are a standard documented as RFC 3986 (https://www.ietf.org/rfc/rfc3986.txt) and are supported by old Conan servers. Nevertheless, in order to use them the same way as Artifactory will, it requires a minor change in Conan codebase too (more information for Conan developers: https://github.com/conan-io/Team-Planning-Execution/issues/8)