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21fb0a3f58
A proxy can be marked as disabled using the keyword with the same name. The doc mentions that it won't process any traffic. However, this is not really the case for backends as they may still be selected via switching rules during stream processing. In fact, currently access to disabled backends will be conducted up to assign_server(). However, no eligible server is found at this stage, resulting in a connection closure or an HTTP 503, which is expected. So in the end, servers in disabled backends won't receive any traffic. But this is only because post-parsing steps are not performed on such backends. Thus, this can be considered as functional but only via side-effects. This patch clarifies the handling of disable backends, so that they are never selected via switching rules. Now, process_switching_rules() will ignore disable backends and continue rules evaluation. As this is a behavior change, this patch is labelled as medium. The documentation manuel for use_backend is updated accordingly.