我正在嘗試這個 Go 代碼package mainimport ( "github.com/gorilla/mux" "io" "log" "net/http")func HealthCheckHandler(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) w.Header().Set("Content-Type", "application/json") io.WriteString(w, `{"alive": true}`)}func main() { router := mux.NewRouter() router.HandleFunc("/health", HealthCheckHandler).Methods("GET") log.Printf("running server ...") log.Fatal(http.ListenAndServe(":8000", router))}通過這個測試package mainimport ( "net/http" "net/http/httptest" "testing")func TestHealthCheckHandler(t *testing.T) { req, err := http.NewRequest("GET", "/health", nil) if err != nil { t.Fatal(err) } rr := httptest.NewRecorder() handler := http.HandlerFunc(HealthCheckHandler) handler.ServeHTTP(rr, req) if status := rr.Code; status != http.StatusOK { t.Errorf("handler returned wrong status code: got %v want %v", status, http.StatusOK) } t.Logf("%v", rr.Header()) if ctype := rr.Header().Get("Content-Type"); ctype != "application/json" { t.Errorf("content type header does not match: got %v want %v", ctype, "application/json") }}當我運行測試時，一切正常go test -v=== RUN TestHealthCheckHandler--- PASS: TestHealthCheckHandler (0.00s) handlers_test.go:24: map[Content-Type:[application/json]]PASSok 0.012s是，但是當我運行該服務并用 curl 調用它時Content-Type，是application/jsonContent-Typetext/plaincurl -v localhost:8000/health* Trying ::1...* Connected to localhost (::1) port 8000 (#0)> GET /health HTTP/1.1> Host: localhost:8000> User-Agent: curl/7.43.0> Accept: */*>< HTTP/1.1 200 OK< Date: Thu, 14 Feb 2019 01:37:15 GMT< Content-Length: 15< Content-Type: text/plain; charset=utf-8<* Connection #0 to host localhost left intact為什么行為不同于測試和執行？
2 回答
MMMHUHU
TA貢獻1834條經驗 獲得超8個贊
問題是您在標題之前發送了身體。這在任何語言中都行不通——這是 HTTP 的事實，而不是 Go 的事實。
它沒有被您的測試捕獲的原因是您的測試實際上是在濫用ResponseRecorder；您在地圖中設置字段，然后直接從該地圖讀取字段。測試應該只檢查ResponseRecorder.Result，它旨在為您提供客戶端實際收到的結果，包括在發送正文時鎖定標頭：
if ctype := rr.Response().Header.Get("Content-Type"); ctype != "application/json" {
t.Errorf("content type header does not match: got %v want %v",
ctype, "application/json")
}
婷婷同學_
TA貢獻1844條經驗 獲得超8個贊
只需將您的功能更改為：
func HealthCheckHandler(w http.ResponseWriter, r *http.Request) {
// this will cause a duplicate status header to be written
// w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
io.WriteString(w, `{"alive": true}`)
}
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