Unable to bind url params

[abaird1992]

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Issue Description

When I use the Context#Bind method of the Context#DefaultBinder (default implementation for the Context#Binder interface), I cannot bind the parameters contained in the url/path of the request.

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behavior

Code for the handler (derived from the examples in the documentation):

e.GET("/users/:name", func(c echo.Context) error {
  u := new(User)
  if err = c.Bind(u); err != nil {
    return
  }
  return c.JSON(http.StatusOK, u)
})

Code defining user type, also taken from the examples in the documentation

// User
type User struct {
  Name  string `json:"name" form:"name" url:"name"`
  Email string `json:"email" form:"email" query:"email"`
}

If I run the following request:

curl -XGET http://localhost:1323/users/Joe\?email\=joe_email

I would expect the Name field in u to be equal to "Joe".

Actual behavior

When executing the following request:

curl -XGET http://localhost:1323/users/Joe\?email\=joe_email

The Name field in u remains empty.

Steps to reproduce

Working code to debug

Version/commit

v4.1.5

[saka-shin]

The path parameter should be retrieved via echo.Context#Param(string) string
https://echo.labstack.com/guide/request
Please refer to the path parameter section.

So, your code will be like following.

e.GET("/users/:name", func(c echo.Context) error {
  u := new(User)
  u.Name = c.Param("name")
  if err = c.Bind(u); err != nil {
    return
  }
  return c.JSON(http.StatusOK, u)
})

[vishr]

We don't support binding path parameter, this is something for v5. #1302