r.group not working

[RoelVanNyen]

I made a quick test with custom middleware groups:

func TestHandle() gin.HandlerFunc {
    return func(c *gin.Context) {
        fmt.Printf("TEST: \n" )

        c.Next()

        fmt.Printf("TEST2: \n" )
    }
}

 r.Group("/", TestHandle()) {
        r.GET("/test", func(c *gin.Context) {
            fmt.Printf("test")
            c.String(200, "ok")
        })
}

TEST and TEST2 never gets printed.

I do get a warning:
[GIN] WARNING. Headers were already written!

Any ideas ?

[manucorporat]

You are referencing the same "group".

// notify the "test" variable
test := r.Group("/", TestHandle())
test.GET("/test", func(c *gin.Context) {
    fmt.Printf("test")
    c.String(200, "ok")
})

I, personally, like to use the brackets because it gives a sense of group, and makes the routes easier to read.

// notify the "test" variable
test := r.Group("/", TestHandle())
{
    test.GET("/test", func(c *gin.Context) {
        fmt.Printf("test")
        c.String(200, "ok")
    })
}

It's exactly the same.

[manucorporat]

anyway, I am more worried about "[GIN] WARNING. Headers were already written!"
please can you share all the code? and tell me if you still get that warning?

[RoelVanNyen]

Ah ok, did not know I had to use thegroupname.GET :-)
This fixes the problem, now my code works and the warning is gone.

Thanks!

[manucorporat]

anyway, could you post the code? that warning should never appear

[RoelVanNyen]

Its a lot of code so i`ll keep it simple:

func MongoAuth() gin.HandlerFunc {
    return func(c *gin.Context) {
        fmt.Printf("TEST: \n" )
        cookie := c.Request.Header.Get("Cookie")

        fmt.Printf("cookie: %v\n", cookie)

        c.Next()

        fmt.Printf("TEST2: \n" )
    }
}



func main() {
    db := database.GDatabase{}
    db.Initialize()
    gs := Server{}
    gs.db = &db
    ....
    // no more rabbit for the moment
    //gs.initialize_rabbit()

    r := gin.Default()


    r.Group("/", MongoAuth())
    {
        r.GET("/test", func(c *gin.Context) {
            fmt.Printf("test")
            c.String(200, "ok")
        })


        ///////
        // Bitbucket
        r.GET("/auth/login/bitbucket", func(c *gin.Context) {
            ... logic here ...

            c.Redirect(301, "http://localhost:8080/wert")

        })

        r.GET("/auth/login/bitbucket/token", func(c *gin.Context) {
            ... logic here ...
            fmt.Printf("url: %s\n", url)
            if strings.EqualFold("", url) {
                c.String(503, "Internal error")     
            }
            c.Redirect(301, url)
        })

    }
}

[javierprovecho]

@RoelVanNyen sorry for the delay

Pretty sure your warning about headers is related because you write to the response before trying to redirect.