Adds ForwardedByClientIP option

context.go

@@ -251,17 +251,19 @@ func (c *Context) BindWith(obj interface{}, b binding.Binding) error {
 // Best effort algoritm to return the real client IP, it parses
 // X-Real-IP and X-Forwarded-For in order to work properly with reverse-proxies such us: nginx or haproxy.
 func (c *Context) ClientIP() string {
-	clientIP := strings.TrimSpace(c.requestHeader("X-Real-Ip"))
-	if len(clientIP) > 0 {
-		return clientIP
-	}
-	clientIP = c.requestHeader("X-Forwarded-For")
-	if index := strings.IndexByte(clientIP, ','); index >= 0 {
-		clientIP = clientIP[0:index]
-	}
-	clientIP = strings.TrimSpace(clientIP)
-	if len(clientIP) > 0 {
-		return clientIP
+	if c.engine.ForwardedByClientIP {
+		clientIP := strings.TrimSpace(c.requestHeader("X-Real-Ip"))
+		if len(clientIP) > 0 {
+			return clientIP
+		}
+		clientIP = c.requestHeader("X-Forwarded-For")
+		if index := strings.IndexByte(clientIP, ','); index >= 0 {
+			clientIP = clientIP[0:index]
+		}
+		clientIP = strings.TrimSpace(clientIP)
+		if len(clientIP) > 0 {
+			return clientIP
+		}
 	}
 	return strings.TrimSpace(c.Request.RemoteAddr)
 }

gin.go

@@ -14,7 +14,7 @@ import (
 	"github.com/gin-gonic/gin/render"
 )
 
-const Version = "v1.0rc1"
+const Version = "v1.0rc2"
 
 var default404Body = []byte("404 page not found")
 var default405Body = []byte("405 method not allowed")
@@ -59,6 +59,7 @@ type (
 		// If no other Method is allowed, the request is delegated to the NotFound
 		// handler.
 		HandleMethodNotAllowed bool
+		ForwardedByClientIP    bool
 	}
 )
 
@@ -74,7 +75,8 @@ func New() *Engine {
 		RedirectTrailingSlash:  true,
 		RedirectFixedPath:      false,
 		HandleMethodNotAllowed: false,
-		trees: make(methodTrees, 0, 5),
+		ForwardedByClientIP:    true,
+		trees:                  make(methodTrees, 0, 9),
 	}
 	engine.RouterGroup.engine = engine
 	engine.pool.New = func() interface{} {
@@ -90,7 +92,7 @@ func Default() *Engine {
 	return engine
 }
 
-func (engine *Engine) allocateContext() (context *Context) {
+func (engine *Engine) allocateContext() *Context {
 	return &Context{engine: engine}
 }