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Output a 1x1 transparent gif pixel in Go webserver response. Please note, this is only the relevant code, does not work "out-of-the-box".
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import ( | |
"fmt" | |
"net/http" | |
"time" | |
) | |
const transPixel = "\x47\x49\x46\x38\x39\x61\x01\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x21\xF9\x04\x01\x00\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x44\x01\x00\x3B" | |
func pixelHandler(w http.ResponseWriter, r *http.Request) { | |
// Pixel | |
w.Header().Set("Content-Type", "image/gif") | |
w.Header().Set("Last-Modified", time.Now().UTC().Format(http.TimeFormat)) | |
w.Header().Set("Expires", "Wed, 11 Nov 1998 11:11:11 GMT") | |
w.Header().Set("Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0") | |
w.Header().Set("Pragma", "no-cache") | |
fmt.Fprintf(w, transPixel) | |
} |
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