Gin Framework – Part 1

$ mkdir gin-demo

$ cd gin-demo
$ go mod init go-demo
go: creating new go.mod: module go-demo

# Execute in the newly created directory
$ go get -u github.com/gin-gonic/gin
go: downloading github.com/gin-gonic/gin v1.7.7
go: downloading github.com/gin-contrib/sse v0.1.0
go: downloading github.com/mattn/go-isatty v0.0.12
go: downloading github.com/json-iterator/go v1.1.9
go: downloading github.com/golang/protobuf v1.3.3
go: downloading github.com/ugorji/go/codec v1.1.7
go: downloading gopkg.in/yaml.v2 v2.2.8
go: downloading github.com/go-playground/validator/v10 v10.4.1
go: downloading github.com/ugorji/go v1.1.7
go: downloading github.com/json-iterator/go v1.1.12
....omitted

package main
import (
	"github.com/gin-gonic/gin"
)
func main() {
	// Create a default routing engine
	engine := gin.Default()
    // Register a route and set up an anonymous handler to return data in JSON format
	engine.GET("/", func(ctx *gin.Context) {
		ctx.JSON(200,gin.H{
			"msg":"request succeeded",
		})
	})
	// Start the service and listen on port 9090，
	// If not filled, the default listener is 0.0.0.0:8080
	_ = engine.Run(":9090")
}

$ go run main.go
[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /                         --> main.main.func1 (3 handlers)
[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
[GIN-debug] Listening and serving HTTP on :9090

$ go run main.go
[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /                         --> main.main.func1 (3 handlers)
[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
[GIN-debug] Listening and serving HTTP on :9090
[GIN] 2022/02/17 - 18:55:17 | 200 |   246.194µs |   127.0.0.1 | GET   "/"
[GIN] 2022/02/17 - 18:55:17 | 404 |       639ns |   127.0.0.1 | GET   "/favicon.ico"
[GIN] 2022/02/17 - 18:55:50 | 200 |    94.146µs |   127.0.0.1 | GET   "/"
[GIN] 2022/02/17 - 18:59:02 | 200 |    62.582µs |   127.0.0.1 | GET   "/"
[GIN] 2022/02/17 - 18:59:08 | 200 |    29.111µs |   127.0.0.1 | GET   "/"