[feature] Gin enable gzip encoding (#405)

* add gin gzip dependency

* add gzip middleware to router

* go mod tidy

vendor/github.com/gin-contrib/gzip/README.md

@@ -0,0 +1,135 @@
+# GZIP gin's middleware
+
+[![Run Tests](https://github.com/gin-contrib/gzip/actions/workflows/go.yml/badge.svg)](https://github.com/gin-contrib/gzip/actions/workflows/go.yml)
+[![codecov](https://codecov.io/gh/gin-contrib/gzip/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-contrib/gzip)
+[![Go Report Card](https://goreportcard.com/badge/github.com/gin-contrib/gzip)](https://goreportcard.com/report/github.com/gin-contrib/gzip)
+[![GoDoc](https://godoc.org/github.com/gin-contrib/gzip?status.svg)](https://godoc.org/github.com/gin-contrib/gzip)
+[![Join the chat at https://gitter.im/gin-gonic/gin](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gin-gonic/gin)
+
+Gin middleware to enable `GZIP` support.
+
+## Usage
+
+Download and install it:
+
+```sh
+go get github.com/gin-contrib/gzip
+```
+
+Import it in your code:
+
+```go
+import "github.com/gin-contrib/gzip"
+```
+
+Canonical example:
+
+```go
+package main
+
+import (
+  "fmt"
+  "net/http"
+  "time"
+
+  "github.com/gin-contrib/gzip"
+  "github.com/gin-gonic/gin"
+)
+
+func main() {
+  r := gin.Default()
+  r.Use(gzip.Gzip(gzip.DefaultCompression))
+  r.GET("/ping", func(c *gin.Context) {
+    c.String(http.StatusOK, "pong "+fmt.Sprint(time.Now().Unix()))
+  })
+
+  // Listen and Server in 0.0.0.0:8080
+  if err := r.Run(":8080"); err != nil {
+    log.Fatal(err)
+  }
+}
+```
+
+Customized Excluded Extensions
+
+```go
+package main
+
+import (
+  "fmt"
+  "net/http"
+  "time"
+
+  "github.com/gin-contrib/gzip"
+  "github.com/gin-gonic/gin"
+)
+
+func main() {
+  r := gin.Default()
+  r.Use(gzip.Gzip(gzip.DefaultCompression, gzip.WithExcludedExtensions([]string{".pdf", ".mp4"})))
+  r.GET("/ping", func(c *gin.Context) {
+    c.String(http.StatusOK, "pong "+fmt.Sprint(time.Now().Unix()))
+  })
+
+  // Listen and Server in 0.0.0.0:8080
+  if err := r.Run(":8080"); err != nil {
+    log.Fatal(err)
+  }
+}
+```
+
+Customized Excluded Paths
+
+```go
+package main
+
+import (
+  "fmt"
+  "net/http"
+  "time"
+
+  "github.com/gin-contrib/gzip"
+  "github.com/gin-gonic/gin"
+)
+
+func main() {
+  r := gin.Default()
+  r.Use(gzip.Gzip(gzip.DefaultCompression, gzip.WithExcludedPaths([]string{"/api/"})))
+  r.GET("/ping", func(c *gin.Context) {
+    c.String(http.StatusOK, "pong "+fmt.Sprint(time.Now().Unix()))
+  })
+
+  // Listen and Server in 0.0.0.0:8080
+  if err := r.Run(":8080"); err != nil {
+    log.Fatal(err)
+  }
+}
+```
+
+Customized Excluded Paths
+
+```go
+package main
+
+import (
+  "fmt"
+  "net/http"
+  "time"
+
+  "github.com/gin-contrib/gzip"
+  "github.com/gin-gonic/gin"
+)
+
+func main() {
+  r := gin.Default()
+  r.Use(gzip.Gzip(gzip.DefaultCompression, gzip.WithExcludedPathsRegexs([]string{".*"})))
+  r.GET("/ping", func(c *gin.Context) {
+    c.String(http.StatusOK, "pong "+fmt.Sprint(time.Now().Unix()))
+  })
+
+  // Listen and Server in 0.0.0.0:8080
+  if err := r.Run(":8080"); err != nil {
+    log.Fatal(err)
+  }
+}
+```