added golangci-linting, refactor, simplified error msgs and fixed some error handling

internal/api/v1/utils/http_client.go

@@ -8,20 +8,22 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 )
 
-var HTTPClient = &http.Client{
-	Timeout: common.ConnectionTimeout,
-	Transport: &http.Transport{
-		Proxy:             http.ProxyFromEnvironment,
-		DisableKeepAlives: true,
-		ForceAttemptHTTP2: true,
-		DialContext: (&net.Dialer{
-			Timeout:   common.DialTimeout,
-			KeepAlive: common.KeepAlive, // this is different from DisableKeepAlives
-		}).DialContext,
-		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-	},
-}
+var (
+	HTTPClient = &http.Client{
+		Timeout: common.ConnectionTimeout,
+		Transport: &http.Transport{
+			Proxy:             http.ProxyFromEnvironment,
+			DisableKeepAlives: true,
+			ForceAttemptHTTP2: true,
+			DialContext: (&net.Dialer{
+				Timeout:   common.DialTimeout,
+				KeepAlive: common.KeepAlive, // this is different from DisableKeepAlives
+			}).DialContext,
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
 
-var Get = HTTPClient.Get
-var Post = HTTPClient.Post
-var Head = HTTPClient.Head
+	Get  = HTTPClient.Get
+	Post = HTTPClient.Post
+	Head = HTTPClient.Head
+)

internal/api/v1/utils/utils.go

@@ -5,16 +5,26 @@ import (
 	"net/http"
 )
 
-func RespondJson(w http.ResponseWriter, data any, code ...int) error {
+func WriteBody(w http.ResponseWriter, body []byte) {
+	if _, err := w.Write(body); err != nil {
+		HandleErr(w, nil, err)
+	}
+}
+
+func RespondJSON(w http.ResponseWriter, r *http.Request, data any, code ...int) bool {
 	if len(code) > 0 {
 		w.WriteHeader(code[0])
 	}
 	w.Header().Set("Content-Type", "application/json")
 	j, err := json.MarshalIndent(data, "", "  ")
 	if err != nil {
-		return err
-	} else {
-		w.Write(j)
+		HandleErr(w, r, err)
+		return false
 	}
-	return nil
+	_, err = w.Write(j)
+	if err != nil {
+		HandleErr(w, r, err)
+		return false
+	}
+	return true
 }