Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1989631

Description of problem:
Aug 3 11:36:29 dhcp-2-205 foreman: /usr/share/foreman/lib/proxy_api/resource.rb:72: warning: URI.escape is obsolete
Aug 3 11:36:30 dhcp-2-205 smart-proxy: 10.1.2.205 - - [03/Aug/2021:11:36:30 EDT] "GET /tftp/serverName HTTP/1.1" 200 26
Aug 3 11:36:30 dhcp-2-205 smart-proxy: - -> /tftp/serverName
Aug 3 11:36:30 dhcp-2-205 foreman: /usr/share/foreman/lib/proxy_api/resource.rb:72: warning: URI.escape is obsolete
Aug 3 11:36:30 dhcp-2-205 smart-proxy: 10.1.2.205 - - [03/Aug/2021:11:36:30 EDT] "GET /tftp/serverName HTTP/1.1" 200 26
Aug 3 11:36:30 dhcp-2-205 smart-proxy: - -> /tftp/serverName
Aug 3 11:36:30 dhcp-2-205 foreman: /usr/share/foreman/lib/proxy_api/resource.rb:72: warning: URI.escape is obsolete
Aug 3 11:36:30 dhcp-2-205 smart-proxy: 10.1.2.205 - - [03/Aug/2021:11:36:30 EDT] "GET /dhcp/10.1.5.72/mac/56:6f:0d:72:07:b3 HTTP/1.1" 200 272
Aug 3 11:36:30 dhcp-2-205 smart-proxy: - -> /dhcp/10.1.5.72/mac/56:6f:0d:72:07:b3
Aug 3 11:36:30 dhcp-2-205 foreman: /usr/share/foreman/lib/proxy_api/resource.rb:72: warning: URI.escape is obsolete
Aug 3 11:36:30 dhcp-2-205 smart-proxy: 10.1.2.205 - - [03/Aug/2021:11:36:30 EDT] "GET /dhcp/10.1.5.72/ip/10.1.5.76 HTTP/1.1" 200 274
Aug 3 11:36:30 dhcp-2-205 smart-proxy: - -> /dhcp/10.1.5.72/ip/10.1.5.76

Version-Release number of selected component (if applicable):
tfm-rubygem-rails-6.0.3.7-1.el7sat.noarch
rh-ruby27-ruby-libs-2.7.3-129.el7.x86_64
rh-ruby27-runtime-2.7-2.el7.x86_64
rh-ruby27-ruby-2.7.3-129.el7.x86_64
foreman-2.5.2-1.el7sat.noarch
satellite-6.10.0-0.5.beta.el7sat.noarch

How reproducible:
Every time

Steps to Reproduce:
1. Provision host using unattended install.
2. See /var/log/messages at the moment when the host reports back to Satellite after it is provisioned

Actual results:
Satellite is using obsolete methods, warnings are generated.

Expected results:
Satellite is not using obsolete methods, no warnings about obsolete methods are present in the logs.

Additional info:
I expect the fix to be not only in the Foreman itself but also in its plugins that use this obsolete method.
BZ1982343 is dealing with the same issue in Katello.