fix issue of nil response handling for ghttp.Client

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/gomodule/redigo v2.0.0+incompatible
 	github.com/gorilla/websocket v1.4.1
 	github.com/grokify/html-strip-tags-go v0.0.0-20190921062105-daaa06bf1aaf
+	github.com/mattn/go-runewidth v0.0.10 // indirect
 	github.com/olekukonko/tablewriter v0.0.1
 	go.opentelemetry.io/otel v0.16.0
 	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102

net/ghttp/internal/client/client_dump.go

@@ -58,7 +58,7 @@ func (r *Response) RawRequest() string {
 
 // RawResponse returns the raw content of the response.
 func (r *Response) RawResponse() string {
-	// Response can be nil.
+	// Response might be nil.
 	if r == nil || r.Response == nil {
 		return ""
 	}

net/ghttp/internal/client/client_request.go

@@ -117,7 +117,7 @@ func (c *Client) DoRequest(method, url string, data ...interface{}) (resp *Respo
 	}
 
 	// Auto saving cookie content.
-	if c.browserMode && resp != nil {
+	if c.browserMode && resp != nil && resp.Response != nil {
 		now := time.Now()
 		for _, v := range resp.Response.Cookies() {
 			if !v.Expires.IsZero() && v.Expires.UnixNano() < now.UnixNano() {

net/ghttp/internal/client/client_response.go

@@ -49,6 +49,10 @@ func (r *Response) GetCookieMap() map[string]string {
 
 // ReadAll retrieves and returns the response content as []byte.
 func (r *Response) ReadAll() []byte {
+	// Response might be nil.
+	if r == nil || r.Response == nil {
+		return []byte{}
+	}
 	body, err := ioutil.ReadAll(r.Response.Body)
 	if err != nil {
 		return nil