主机名中的字符“\ _ r \ n”无效：51813

Question

开始学习具有后端目标的golang。我正试图在某个网址上获取网页的内容。这是代码的剪切。

func AddForm(url string) string {
    if url == "" {
        data := ReadByIoutil("file.txt") // the file contains several urls
        array := ParseData(data) // parsing data in T "Object" => Object.url string
        url = "https://"
        url += array[rand.Intn(len(array))].url // choose randomly 1 among urls
        log.Print(url)
    }
    resp, err := http.Get(url) //get content from url
    check(err)
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    content := string(body)
    WriteByOs("index.html", content) //save to another file (optionaly)
    return content
}

// I practically don't understand this block, but I copied from another place but it works as I wanted
func handler(w http.ResponseWriter, r *http.Request) {
    url := r.FormValue("url")
    if url == "" {
        w.Header().Set("Content-Type", "text/html; charset=utf-8")
        url = ""
        //url = "habr.com"
        fmt.Fprint(w, AddForm(url))
        return
    }
}

我检查结构。一切都很好=> Object.url看起来像“example.com”。结构中的每个网址都是开放的，例如， google.com，habr.com。我也注意到了“[PREFIX] .cppreference.com”也叫喊错误。但对我来说很明显，但仍然不明白如何解决这个问题。主要问题是我收到错误而没有打开网址“stackoverflow.com”：

2018/09/19 12:08:16 https://stackoverflow.com
2018/09/19 12:08:16 http: panic serving [::1]:51813: parse https://stackoverflow.com
: invalid character "\r" in host name
goroutine 19 [running]:
net/http.(*conn).serve.func1(0xc00003c8c0)
    C:/Go/src/net/http/server.go:1746 +0xd7
panic(0x665ae0, 0xc0002369f0)
    C:/Go/src/runtime/panic.go:513 +0x1c7
main.check(...)
    C:/Users/dev/go/src/test/main.go:14
main.AddForm(0xc000042800, 0x1b, 0x0, 0x0)
    C:/Users/dev/go/src/test/main.go:100 +0x2e6
main.handler(0x6f1300, 0xc0001447e0, 0xc0000d8c00)
    C:/Users/dev/go/src/test/main.go:114 +0xb2
net/http.HandlerFunc.ServeHTTP(0x6bfb20, 0x6f1300, 0xc0001447e0, 0xc0000d8c00)
    C:/Go/src/net/http/server.go:1964 +0x4b
net/http.(*ServeMux).ServeHTTP(0x899640, 0x6f1300, 0xc0001447e0, 0xc0000d8c00)
    C:/Go/src/net/http/server.go:2361 +0x12e
net/http.serverHandler.ServeHTTP(0xc000048c30, 0x6f1300, 0xc0001447e0, 0xc0000d8c00)
    C:/Go/src/net/http/server.go:2741 +0xb2
net/http.(*conn).serve(0xc00003c8c0, 0x6f1400, 0xc000040280)
    C:/Go/src/net/http/server.go:1847 +0x64d
created by net/http.(*Server).Serve
    C:/Go/src/net/http/server.go:2851 +0x2fc

这是什么？ \ r \ n重定向到本地语言分支？我是网络技术的新手，所以仍然不知道服务器如何响应以及用户隐藏什么但是与机器一起工作。所以，评论问我file.txt。这里（PS。解析器效果很好）：

google.com; yandex.ru; habr.com; xakep.ru; stackoverflow.com

Answer 1

删除EOL字符。您可能必须使用“\ r \ n”或“\ r \ n”

url += strings.TrimSuffix(array[rand.Intn(len(array))].url, "\r")