[Ramone]

Figure out how to log only what you want. Don't let your choice of an inflexible logging system affect your external API.

What do you get? Well many things, but specific to your inquiries: using GET tells the client of your API that the request is cache-able (for better performance -- a browser won't cache POSTs), and it tells that client that it's safe to call without unintended consequences. A search engine spider should be safe to just hit every uri via GET that it finds, because those are supposed to be read-only.