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ctx.String(http.StatusRequestEntityTooLarge, "request too large")

request too large{"error":"HTTP request too large"}

package main

import (
	"net/http"

	limits "github.com/gin-contrib/size"
	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()
	r.Use(limits.RequestSizeLimiter(10))
	r.POST("/", handler)
	_ = r.Run(":8080")
}

func handler(ctx *gin.Context) {
	if file, err := ctx.FormFile("file"); err != nil {
		ctx.JSON(http.StatusOK, gin.H{"msg": "fail: " + err.Error()})
	} else {
		ctx.JSON(http.StatusOK, gin.H{"msg": "ok: " + file.Filename})
	}
}