v1.9.6 (#360)

**🚀 Fiber `v1.9.6`**

Special thanks to @renanbastos93 & @ReneWerner87 for optimizing the current router.
Help use translate our API documentation by [clicking here](https://crowdin.com/project/gofiber)

🔥 New
- `AcquireCtx` / `ReleaseCtx`
The Ctx pool is now accessible for third-party packages
- Fiber docs merged [Russian](https://docs.gofiber.io/v/ru/) translations **84%**
- Fiber docs merged [Spanish](https://docs.gofiber.io/v/es/) translations  **65%**
- Fiber docs merged [French](https://docs.gofiber.io/v/fr/) translations  **40%**
- Fiber docs merged [German](https://docs.gofiber.io/v/de/) translations  **32%**
- Fiber docs merged [Portuguese](https://docs.gofiber.io/v/pt/) translations  **24%**

🩹 Fixes
- Hotfix for interpolated params in nested routes #354
- Some `Ctx` methods didn't work correctly when called without an `*App` pointer.
- `ctx.Vary` sometimes added duplicates to the response header
- Improved router by ditching regexp and increased performance by **817%** without allocations.
```go
// Tested with 350 github API routes
Benchmark_Router_OLD-4      614   2467460 ns/op   68902 B/op   600 allocs/op
Benchmark_Router_NEW-4     3429    302033 ns/op       0 B/op     0 allocs/op
```

🧹 Updates
- Add context benchmarks
- Remove some unnecessary functions from `utils`
- Add router & param test cases
- Add new coffee supporters to readme
- Add third party middlewares to readme
- Add more comments to source code
- Cleanup some old helper functions

🧬 Middleware
- [gofiber/adaptor](https://github.com/gofiber/adaptor) `v0.0.1` Converter for net/http handlers to/from Fiber handlers
- [gofiber/session](https://github.com/gofiber/session) `v1.0.0` big improvements and support for storage providers
- [gofiber/logger](https://github.com/gofiber/logger) `v0.0.6` supports `${error}` param
- [gofiber/embed](https://github.com/gofiber/embed) `v0.0.9` minor improvements and support for directory browsing 

Co-authored-by: ReneWerner87 <renewerner87@googlemail.com>

app_test.go

@@ -20,6 +20,33 @@ func testStatus200(t *testing.T, app *App, url string, method string) {
 	assertEqual(t, 200, resp.StatusCode, "Status code")
 }
 
+func Test_Nested_Params(t *testing.T) {
+	app := New()
+
+	app.Get("/test", func(c *Ctx) {
+		t.Log(c.Route().Path)
+		c.Status(400).Send("Should move on")
+	})
+	app.Get("/test/:param", func(c *Ctx) {
+		t.Log(c.Route().Path)
+		c.Status(400).Send("Should move on")
+	})
+	app.Get("/test/:param/test", func(c *Ctx) {
+		t.Log(c.Route().Path)
+		c.Status(400).Send("Should move on")
+	})
+	app.Get("/test/:param/test/:param2", func(c *Ctx) {
+		t.Log(c.Route().Path)
+		c.Status(200).Send("Good job")
+	})
+
+	req := httptest.NewRequest("GET", "/test/john/test/doe", nil)
+	resp, err := app.Test(req)
+
+	assertEqual(t, nil, err, "app.Test(req)")
+	assertEqual(t, 200, resp.StatusCode, "Status code")
+}
+
 func Test_Raw(t *testing.T) {
 	app := New()
 	app.Get("/", func(c *Ctx) {
@@ -65,9 +92,6 @@ func Test_Methods(t *testing.T) {
 	app.Connect("/:john?/:doe?", dummyHandler)
 	testStatus200(t, app, "/john/doe", "CONNECT")
 
-	app.Connect("/:john?/:doe?", dummyHandler)
-	testStatus200(t, app, "/john/doe", "CONNECT")
-
 	app.Put("/:john?/:doe?", dummyHandler)
 	testStatus200(t, app, "/john/doe", "CONNECT")
 

params.go

@@ -13,8 +13,8 @@ import (
 
 // paramsParser holds the path segments and param names
 type parsedParams struct {
-	Segs []paramSeg
-	Keys []string
+	Segs   []paramSeg
+	Params []string
 }
 
 // paramsSeg holds the segment metadata
@@ -28,11 +28,10 @@ type paramSeg struct {
 
 var paramsDummy = make([]string, 100, 100)
 
+const wildcardParam string = "*"
+
 // New ...
 func parseParams(pattern string) (p parsedParams) {
-	if pattern[0] != '/' {
-		pattern = "/" + pattern
-	}
 	var patternCount int
 	aPattern := []string{""}
 	if pattern != "" {
@@ -53,7 +52,7 @@ func parseParams(pattern string) (p parsedParams) {
 			out[segIndex] = paramSeg{
 				Param:      paramTrimmer(aPattern[i]),
 				IsParam:    true,
-				IsOptional: aPattern[i] == "*" || aPattern[i][partLen-1] == '?',
+				IsOptional: aPattern[i] == wildcardParam || aPattern[i][partLen-1] == '?',
 			}
 			params = append(params, out[segIndex].Param)
 		} else {
@@ -75,14 +74,14 @@ func parseParams(pattern string) (p parsedParams) {
 	}
 	out[segIndex-1].IsLast = true
 
-	p = parsedParams{Segs: out[:segIndex:segIndex], Keys: params}
-	// fmt.Printf("%+v\n", p)
+	p = parsedParams{Segs: out[:segIndex:segIndex], Params: params}
+	//fmt.Printf("%+v\n", p)
 	return
 }
 
 // Match ...
 func (p *parsedParams) matchParams(s string) ([]string, bool) {
-	lenKeys := len(p.Keys)
+	lenKeys := len(p.Params)
 	params := paramsDummy[0:lenKeys:lenKeys]
 	var i, j, paramsIterator, partLen int
 	if len(s) > 0 {
@@ -93,11 +92,13 @@ func (p *parsedParams) matchParams(s string) ([]string, bool) {
 		// check parameter
 		if segment.IsParam {
 			// determine parameter length
-			if segment.IsLast {
-				i = partLen
-			} else if segment.Param == "*" {
-				// for the expressjs behavior -> "/api/*/:param" - "/api/joker/batman/robin/1" -> "joker/batman/robin", "1"
-				i = findCharPos(s, '/', strings.Count(s, "/")-(len(p.Segs)-(index+1))+1)
+			if segment.Param == wildcardParam {
+				if segment.IsLast {
+					i = partLen
+				} else {
+					// for the expressjs behavior -> "/api/*/:param" - "/api/joker/batman/robin/1" -> "joker/batman/robin", "1"
+					i = findCharPos(s, '/', strings.Count(s, "/")-(len(p.Segs)-(index+1))+1)
+				}
 			} else {
 				i = strings.IndexByte(s, '/')
 			}
@@ -129,10 +130,12 @@ func (p *parsedParams) matchParams(s string) ([]string, bool) {
 			s = s[j:]
 		}
 	}
+	if len(s) != 0 {
+		return nil, false
+	}
 
 	return params, true
 }
-
 func paramTrimmer(param string) string {
 	start := 0
 	end := len(param)

router.go

@@ -168,7 +168,7 @@ func (app *App) registerMethod(method, path string, handlers ...func(*Ctx)) {
 
 			Path:    path,
 			Method:  method,
-			Params:  isParsed.Keys,
+			Params:  isParsed.Params,
 			Handler: handlers[i],
 		}
 		if method == "*" {