Gin Why do long requests block each other?

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Description

The requests to http://127.0.0.1:8080/aaa block each other, but the requests to http://127.0.0.1:8080/bbb are not affected. Why? Is this to restrict duplicate requests?

Demo:

http://127.0.0.1:8080/aaa
http://127.0.0.1:8080/aaa
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb

Console Output:

777.1
777.2
777.2
777.2
777.2
777.1

How to reproduce

package main

import (
    "fmt"
    "net/http"
    "time"

    "github.com/gin-gonic/gin"
)

func handler(c *gin.Context) {
    fmt.Println(777.1)
    time.Sleep(10 * time.Second)
    c.String(http.StatusOK, "Sleep")
}

func handler2(c *gin.Context) {
    fmt.Println(777.2)
    c.String(http.StatusOK, "OK")
}

func main() {
    router := gin.Default()

    router.GET("/aaa", handler)
    router.GET("/bbb", handler2)

    err := router.Run(":8080")
    if err != nil {
        fmt.Println(err)
    }
}

Environment

• go version: go version go1.20.3 darwin/amd64
• gin version (or commit ref): github.com/gin-gonic/gin v1.9.1
• operating system: macos 12.6.2 (cpu: i5 4690T mem:16G)

The same issue exists on Linux as well.

Comment From: fanybook

The issue was resolved after modifying the route.

Demo:

http://127.0.0.1:8080/aaa
http://127.0.0.1:8080/aaa2
http://127.0.0.1:8080/aaa3
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb

Console Output:

777.1
777.1
777.1
777.2
777.2
777.2
777.2

package main

import (
    "fmt"
    "net/http"
    "time"

    "github.com/gin-gonic/gin"
)

func handler(c *gin.Context) {
    fmt.Println(777.1)
    time.Sleep(10 * time.Second)
    c.String(http.StatusOK, "Sleep")
}

func handler2(c *gin.Context) {
    fmt.Println(777.2)
    c.String(http.StatusOK, "OK")
}

func main() {
    router := gin.Default()

    router.GET("/aaa", handler)
    router.GET("/bbb", handler2)
    router.GET("/aaa2", handler)
    router.GET("/aaa3", handler)

    err := router.Run(":8080")
    if err != nil {
        fmt.Println(err)
    }
}

Comment From: fanybook

The issue was resolved after modifying the query of url.

Demo:

http://127.0.0.1:8080/aaa?a=1
http://127.0.0.1:8080/aaa?a=2
http://127.0.0.1:8080/aaa?a=3
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb
http://127.0.0.1:8080/bbb

Console Output:

777.1
777.1
777.1
777.2
777.2
777.2
777.2

package main

import (
    "fmt"
    "net/http"
    "time"

    "github.com/gin-gonic/gin"
)

func handler(c *gin.Context) {
    fmt.Println(777.1)
    time.Sleep(10 * time.Second)
    c.String(http.StatusOK, "Sleep")
}

func handler2(c *gin.Context) {
    fmt.Println(777.2)
    c.String(http.StatusOK, "OK")
}

func main() {
    router := gin.Default()

    router.GET("/aaa", handler)
    router.GET("/bbb", handler2)

    err := router.Run(":8080")
    if err != nil {
        fmt.Println(err)
    }
}

Comment From: fanybook

Postman doesn't have this issue, it may just be a problem of Chrome