Go http标准库中的内存泄漏

从您在注释中提供的堆pprof看起来，您正在通过gorilla/sessions和gorilla/context(几乎400MB)泄漏内存.

参考这个ML线程:https://groups.google.com/forum/#!msg/gorilla-web/clJfCzenuWY/N_Xj9-5Lk6wJ和这个GH问题:https://github.com/gorilla/sessions/issues/15

以下是一个泄露速度极快的版本:

package main

import (
    "fmt"
    // "github.com/gorilla/context"
    "github.com/gorilla/sessions"
    "net/http"
)

var (
    cookieStore = sessions.NewCookieStore([]byte("cookie-secret"))
)

func main() {
    http.HandleFunc("/", defaultHandler)
    http.ListenAndServe(":8080", nil)
}

func defaultHandler(w http.ResponseWriter, r *http.Request) {
    cookieStore.Get(r, "leak-test")
    fmt.Fprint(w, "Hi there")
}

这里有一个清理过的，有一个相对静电的rss:

package main

import (
    "fmt"
    "github.com/gorilla/context"
    "github.com/gorilla/sessions"
    "net/http"
)

var (
    cookieStore = sessions.NewCookieStore([]byte("cookie-secret"))
)

func main() {
    http.HandleFunc("/", defaultHandler)
    http.ListenAndServe(":8080", context.ClearHandler(http.DefaultServeMux))
}

func defaultHandler(w http.ResponseWriter, r *http.Request) {
    cookieStore.Get(r, "leak-test")
    fmt.Fprint(w, "Hi there")
}