http4 component should not assume the scheme by looking up the request address

There is an user complains the camel-http4 component doesn't work rightly behind a proxy when endpoint address is start with http4s [1] . I just checked the code of camel-http4, it will try to setup the proxy schema to be https4 when the real address is start from https. That is not right. User should be able to define the scheme for the proxy himself. [1] http://camel.465427.n5.nabble.com/Using-the-HTTP4-component-to-make-a-HTTPS-call-behinf-proxy-sever-tp5719105.html