A routing bug?

[zituocn]

Description

code：

package main

import (
    "net/http"
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    r.GET("/read_:id.htm", func(c *gin.Context) {
        id := c.Param("id")
        c.JSON(http.StatusOK, gin.H{
            "message": "pong",
            "id":      id,
        })
    })
    r.Run()
}

can match the following requests：

1. /read_1
2. /read_1.htm
3. /read_1.html
4. /read_1.aaaaaaaa
5. ......

How to do a unique match？

Environment

• go version: go1.18.10
• gin version (or commit ref): v1.8.2
• operating system:

[Cookiery]

Strange usage, maybe you can write id := c.Param("id.htm") Or you can control your route in middleware or function.

[zituocn]

Routes should have unique properties

[pscheid92]

The router's properties are pretty unique. It just is not the properties we expect here 🙈 According to Gin's radix-tree router, a wild card starts with : and ends at the next / or at the end of the given string. In your example, the wild card is id.htm and not id.

---

I guess you expected the router to pars something like this:

• prefix: /read_
• wildcard: :id
• postfix: .htm

---

But as the wildcard ends with the next / or end of the string. So it actually is:

• prefix: /read_
• wildcard: :id.htm