Calling w.Write requires http status code to be set before otherwise it sets default StatusOK. Setting status code multiple times throws superfluous log.
. You may better look for chunked transfer-encoding with http.Flusher.
package main
import (
"io/ioutil"
"log"
"net/http"
"path"
)
func main() {
http.HandleFunc("/files", streamFiles)
err := http.ListenAndServe(":8090", nil)
if err != nil {
log.Fatal(err)
}
}
func streamFiles(w http.ResponseWriter, r *http.Request) {
files, err := ioutil.ReadDir("./files")
if err != nil {
log.Fatal(err)
}
flusher, ok := w.(http.Flusher)
if !ok {
http.NotFound(w, r)
return
}
w.Header().Set("Transfer-Encoding", "chunked")
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
for _, f := range files {
buf, err := ioutil.ReadFile(path.Join("./files", f.Name()))
if err != nil {
log.Fatal(err)
}
w.Write(buf)
flusher.Flush()
}
}