added ip_hash load balancing

updated tests

fixed comment format

fixed formatting, minor logic fix

added newline to EOF

updated logic, fixed tests

added comment

updated formatting

updated test output

fixed typo

caddyhttp/proxy/proxy.go

@@ -27,7 +27,7 @@ type Upstream interface {
 	// The path this upstream host should be routed on
 	From() string
 	// Selects an upstream host to be routed to.
-	Select() *UpstreamHost
+	Select(*http.Request) *UpstreamHost
 	// Checks if subpath is not an ignored path
 	AllowedPath(string) bool
 }
@@ -93,7 +93,7 @@ func (p Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
 	// hosts until timeout (or until we get a nil host).
 	start := time.Now()
 	for time.Now().Sub(start) < tryDuration {
-		host := upstream.Select()
+		host := upstream.Select(r)
 		if host == nil {
 			return http.StatusBadGateway, errUnreachable
 		}