英文:
Go multiple response.WriteHeader calls for Fprint
问题
我想先打印出文本消息，然后在文本下方显示图像。但是我遇到了http: multiple response.WriteHeader calls错误。
如何在一个处理程序中同时提供图像和文本，以在单个页面中显示？
func handler(w http.ResponseWriter, r *http.Request) {fmt.Fprint(w, "Hello, world!")fp := path.Join("images", "gopher.png")http.ServeFile(w, r, fp)}func main() {http.HandleFunc("/", handler)http.ListenAndServe(":3000", nil)}
英文:
I want to print out the text message first and below the text, diplay the image.
But I am getting http: multiple response.WriteHeader calls errors.
How do I serve iamges and text using one hadler in one single page?
func handler(w http.ResponseWriter, r *http.Request) {fmt.Fprint(w, "Hello, world!")fp := path.Join("images", "gopher.png")http.ServeFile(w, r, fp)}func main() {http.HandleFunc("/", handler)http.ListenAndServe(":3000", nil)}
答案1
得分: 0
你不能先写文本，然后调用ServeFile来输出文本后的二进制图片。
如果你想在图片中显示文本，可以使用HTML，设置一个静态文件处理程序，并使用HTML代码：
var tmpl = `<!doctype html><html><head><title>%s</title></head><body><h1>%s</h1><div><img src="images/%s"></div></body></html>`func handler(w http.ResponseWriter, r *http.Request) {fmt.Fprintf(w, tmpl, "Hello, world!", "Hello, world!", "gopher.png")}func main() {http.HandleFunc("/", handler)http.Handle("/images/", http.FileServer(http.Dir("images/")))http.ListenAndServe(":3000", nil)}
英文:
You can't write text then call ServeFile to output a binary picture after the text.
If you want to serve text with the image then use html, setup a static file handler and use html:
var tmpl = `<!doctype html><html><head><title>%s</title></head><body><h1>%s</h1><div><img src="images/%s"></div></body></html>`func handler(w http.ResponseWriter, r *http.Request) {fmt.Fprintf(w, tmpl, "Hello, world!", "Hello, world!", "gopher.png")}func main() {http.HandleFunc("/", handler)http.Handle("/images/", http.FileServer(http.Dir("images/")))http.ListenAndServe(":3000", nil)}
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