func (s *Server) serveHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
// strip out the port because it's not used in virtual
// hosting; the port is irrelevant because each listener
// is on a different port.
hostname, _, err := net.SplitHostPort(r.Host)
if err != nil {
hostname = r.Host
}
// look up the virtualhost; if no match, serve error
vhost, pathPrefix := s.vhosts.Match(hostname + r.URL.Path)
if vhost == nil {
// check for ACME challenge even if vhost is nil;
// could be a new host coming online soon
if caddytls.HTTPChallengeHandler(w, r, caddytls.DefaultHTTPAlternatePort) {
return 0, nil
}
// otherwise, log the error and write a message to the client
remoteHost, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
remoteHost = r.RemoteAddr
}
WriteTextResponse(w, http.StatusNotFound, "No such site at "+s.Server.Addr)
log.Printf("[INFO] %s - No such site at %s (Remote: %s, Referer: %s)",
hostname, s.Server.Addr, remoteHost, r.Header.Get("Referer"))
return 0, nil
}
// we still check for ACME challenge if the vhost exists,
// because we must apply its HTTP challenge config settings
if s.proxyHTTPChallenge(vhost, w, r) {
return 0, nil
}
// trim the path portion of the site address from the beginning of
// the URL path, so a request to example.com/foo/blog on the site
// defined as example.com/foo appears as /blog instead of /foo/blog.
if pathPrefix != "/" {
r.URL.Path = strings.TrimPrefix(r.URL.Path, pathPrefix)
if !strings.HasPrefix(r.URL.Path, "/") {
r.URL.Path = "/" + r.URL.Path
}
}
// Apply the path-based request body size limit
// The error returned by MaxBytesReader is meant to be handled
// by whichever middleware/plugin that receives it when calling
// .Read() or a similar method on the request body
if r.Body != nil {
for _, pathlimit := range vhost.MaxRequestBodySizes {
if Path(r.URL.Path).Matches(pathlimit.Path) {
r.Body = MaxBytesReader(w, r.Body, pathlimit.Limit)
break
}
}
}
return vhost.middlewareChain.ServeHTTP(w, r)
}
// proxyHTTPChallenge solves the ACME HTTP challenge if r is the HTTP
// request for the challenge. If it is, and if the request has been
// fulfilled (response written), true is returned; false otherwise.
// If you don't have a vhost, just call the challenge handler directly.
func (s *Server) proxyHTTPChallenge(vhost *SiteConfig, w http.ResponseWriter, r *http.Request) bool {
if vhost.Addr.Port != caddytls.HTTPChallengePort {
return false
}
if vhost.TLS != nil && vhost.TLS.Manual {
return false
}
altPort := caddytls.DefaultHTTPAlternatePort
if vhost.TLS != nil && vhost.TLS.AltHTTPPort != "" {
altPort = vhost.TLS.AltHTTPPort
}
return caddytls.HTTPChallengeHandler(w, r, altPort)
}