feat: add rest/httpc to make http requests governacible (#1638)

* feat: change x-trace-id to traceparent to follow opentelemetry

* feat: add rest/httpc to make http requests governacible

* chore: remove blank lines

rest/httpc/requests.go

@@ -0,0 +1,53 @@
+package httpc
+
+import (
+	"net/http"
+
+	"github.com/zeromicro/go-zero/core/breaker"
+	"github.com/zeromicro/go-zero/core/logx"
+	"github.com/zeromicro/go-zero/rest/httpc/internal"
+)
+
+var interceptors = []internal.Interceptor{
+	internal.LogInterceptor,
+}
+
+type Option func(cli *http.Client)
+
+// Do sends an HTTP request to the service assocated with the given key.
+func Do(key string, r *http.Request, opts ...Option) (resp *http.Response, err error) {
+	var respHandlers []internal.ResponseHandler
+	for _, interceptor := range interceptors {
+		var h internal.ResponseHandler
+		r, h = interceptor(r)
+		respHandlers = append(respHandlers, h)
+	}
+
+	resp, err = doRequest(key, r, opts...)
+	if err != nil {
+		logx.Errorf("[HTTP] %s %s/%s - %v", r.Method, r.Host, r.RequestURI, err)
+		return
+	}
+
+	for i := len(respHandlers) - 1; i >= 0; i-- {
+		respHandlers[i](resp)
+	}
+
+	return
+}
+
+func doRequest(key string, r *http.Request, opts ...Option) (resp *http.Response, err error) {
+	brk := breaker.GetBreaker(key)
+	err = brk.DoWithAcceptable(func() error {
+		var cli http.Client
+		for _, opt := range opts {
+			opt(&cli)
+		}
+		resp, err = cli.Do(r)
+		return err
+	}, func(err error) bool {
+		return err == nil && resp.StatusCode < http.StatusInternalServerError
+	})
+
+	return
+}