Meaning of processing controller_name as */* in rails logs

Question

I'm getting following in my production logs.

Processing by Foo::FoosController#robots as */*

In normal cases I see html or json or xml in place of */* .

I wanted to know that what does that */* means ?

Answer 1

as */* shows the accept header used by the client for the request. Robots generally sets the accept header to */* which essentially means "Dear server give my back the response in whatever content type you want according to your preference".

More details here .

an asterisk "*" may be used in place of either the second half of the content-type value, or both halves. This only applies to the Accept: filed, and not to the content-type field of course.

 Accept: *.*, q=0.1 Accept: audio/*, q=0.2 Accept: audio/basic q=1