feat: simplify httpc (#1748)

* feat: simplify httpc

* chore: fix lint errors

* chore: fix log url issue

* chore: fix log url issue

* refactor: handle resp & err in ResponseHandler

* chore: remove unnecessary var names in return clause

rest/httpc/requests.go

@@ -1,21 +1,44 @@
 package httpc
 
 import (
-	"io"
 	"net/http"
+
+	"github.com/zeromicro/go-zero/rest/httpc/internal"
 )
 
-// Do sends an HTTP request to the service assocated with the given key.
-func Do(key string, r *http.Request) (*http.Response, error) {
-	return NewService(key).Do(r)
+var interceptors = []internal.Interceptor{
+	internal.LogInterceptor,
 }
 
-// Get sends an HTTP GET request to the service assocated with the given key.
-func Get(key, url string) (*http.Response, error) {
-	return NewService(key).Get(url)
+// DoRequest sends an HTTP request and returns an HTTP response.
+func DoRequest(r *http.Request) (*http.Response, error) {
+	return request(r, defaultClient{})
 }
 
-// Post sends an HTTP POST request to the service assocated with the given key.
-func Post(key, url, contentType string, body io.Reader) (*http.Response, error) {
-	return NewService(key).Post(url, contentType, body)
+type (
+	client interface {
+		do(r *http.Request) (*http.Response, error)
+	}
+
+	defaultClient struct{}
+)
+
+func (c defaultClient) do(r *http.Request) (*http.Response, error) {
+	return http.DefaultClient.Do(r)
+}
+
+func request(r *http.Request, cli client) (*http.Response, error) {
+	var respHandlers []internal.ResponseHandler
+	for _, interceptor := range interceptors {
+		var h internal.ResponseHandler
+		r, h = interceptor(r)
+		respHandlers = append(respHandlers, h)
+	}
+
+	resp, err := cli.do(r)
+	for i := len(respHandlers) - 1; i >= 0; i-- {
+		respHandlers[i](resp, err)
+	}
+
+	return resp, err
 }