feat: 自定义contentType和body (#2)

Co-authored-by: xiongchuanhong <34299652+xiongchuanhong@users.noreply.github.com>

before_request_hook_test.go

@@ -64,7 +64,7 @@ func Test_setRequestHeader(t *testing.T) {
 	}{
 		Age: 13,
 	}
-
+	data, _ := xml.Marshal(xmlBody)
 	tests := [...]struct {
 		request *Request
 		want    string
@@ -81,6 +81,11 @@ func Test_setRequestHeader(t *testing.T) {
 			request: c.NewRequest().WithXMLBody(xmlBody).Post(),
 			want:    "application/xml; charset=utf-8",
 		},
+		3: {
+			request: c.NewRequest().WithCustomBody("application/xml; charset=utf-8",
+				data).Post(),
+			want: "application/xml; charset=utf-8",
+		},
 	}
 
 	for i, tt := range tests {

request.go

@@ -174,6 +174,13 @@ func (r *Request) WithMultipartFormDataBody(formData ...*FormData) *Request {
 	}
 	return r
 }
+func (r *Request) WithCustomBody(contentType string, body []byte) *Request {
+	r.body = &requestCustomBody{
+		payload:     body,
+		contentType: contentType,
+	}
+	return r
+}
 
 // WithTimeout sets the request timeout.
 func (r *Request) WithTimeout(timeout time.Duration) *Request {

request_body.go

@@ -19,6 +19,19 @@ type requestBody interface {
 	Body() ([]byte, error)
 }
 
+type requestCustomBody struct {
+	payload     []byte
+	contentType string
+}
+
+func (body *requestCustomBody) ContentType() string {
+	return body.contentType
+}
+
+func (body *requestCustomBody) Body() ([]byte, error) {
+	return body.payload, nil
+}
+
 type requestJSONBody struct {
 	payload interface{}
 }