Request Logging

The application logger we’ve seen above it’s used to log application-releated information and errors. At the other hand, the Access Logger, we see below, is used to log the incoming HTTP requests and responses.

package main
import (
    "os"
    "github.com/kataras/iris/v12"
    "github.com/kataras/iris/v12/middleware/accesslog"
)
// Read the example and its comments carefully.
func makeAccessLog() *accesslog.AccessLog {
    // Initialize a new access log middleware.
    ac := accesslog.File("./access.log")
    // Remove this line to disable logging to console:
    ac.AddOutput(os.Stdout)
    // The default configuration:
    ac.Delim = '|'
    ac.TimeFormat = "2006-01-02 15:04:05"
    ac.Async = false
    ac.IP = true
    ac.BytesReceivedBody = true
    ac.BytesSentBody = true
    ac.BytesReceived = false
    ac.BytesSent = false
    ac.BodyMinify = true
    ac.RequestBody = true
    ac.ResponseBody = false
    ac.KeepMultiLineError = true
    ac.PanicLog = accesslog.LogHandler
    // Default line format if formatter is missing:
    // Time|Latency|Code|Method|Path|IP|Path Params Query Fields|Bytes Received|Bytes Sent|Request|Response|
    //
    // Set Custom Formatter:
    ac.SetFormatter(&accesslog.JSON{
        Indent:    "  ",
        HumanTime: true,
    })
    // ac.SetFormatter(&accesslog.CSV{})
    // ac.SetFormatter(&accesslog.Template{Text: "{{.Code}}"})
    return ac
}
func main() {
    ac := makeAccessLog()
    defer ac.Close() // Close the underline file.
    app := iris.New()
    // Register the middleware (UseRouter to catch http errors too).
    app.UseRouter(ac.Handler)
    app.Get("/", indexHandler)
    app.Listen(":8080")
}
func indexHandler(ctx iris.Context) {
    ctx.WriteString("OK")
}

Read more examples at: _examples/logging/request-logger.