Remove unused roundtripper code

client/rpc_client.go

@@ -3,7 +3,6 @@ package client
 import (
 	"encoding/json"
 	"fmt"
-	"net/http"
 	"sync"
 
 	"github.com/micro/go-micro/broker"
@@ -18,10 +17,6 @@ import (
 	"golang.org/x/net/context"
 )
 
-type headerRoundTripper struct {
-	r http.RoundTripper
-}
-
 type rpcClient struct {
 	once sync.Once
 	opts options
@@ -56,11 +51,6 @@ func newRpcClient(opt ...Option) Client {
 	}
 }
 
-func (t *headerRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
-	r.Header.Set("X-Client-Version", "1.0")
-	return t.r.RoundTrip(r)
-}
-
 func (r *rpcClient) codecFunc(contentType string) (codecFunc, error) {
 	if cf, ok := r.opts.codecs[contentType]; ok {
 		return codecWrap(cf), nil