fix: support null body on status 200

client.go

@@ -244,6 +244,11 @@ func (c *client) handleResponse(req *internalRequest, body []byte, internalError
 		} else {
 			internalError.ResponseToString = string(body)
 
+			if internalError.ResponseToString == nullBody {
+				req.withResponse = nil
+				return nil
+			}
+
 			var err error
 			if resp, ok := req.withResponse.(json.Unmarshaler); ok {
 				err = resp.UnmarshalJSON(body)

client_test.go

@@ -77,6 +77,10 @@ func TestExecuteRequest(t *testing.T) {
 			msg := []byte(`{"message":"post successful"}`)
 			_, _ = w.Write(msg)
 
+		} else if r.Method == http.MethodGet && r.URL.Path == "/test-null-body" {
+			w.WriteHeader(http.StatusOK)
+			msg := []byte(`null`)
+			_, _ = w.Write(msg)
 		} else if r.Method == http.MethodPost && r.URL.Path == "/test-post-encoding" {
 			w.WriteHeader(http.StatusCreated)
 			msg := []byte(`{"message":"post successful"}`)
@@ -236,6 +240,18 @@ func TestExecuteRequest(t *testing.T) {
 			expectedResp: nil,
 			wantErr:      false,
 		},
+		{
+			name: "Test null body response",
+			internalReq: &internalRequest{
+				endpoint:            "/test-null-body",
+				method:              http.MethodGet,
+				withResponse:        make([]byte, 0),
+				contentType:         "application/json",
+				acceptedStatusCodes: []int{http.StatusOK},
+			},
+			expectedResp: nil,
+			wantErr:      false,
+		},
 		{
 			name: "400 Bad Request",
 			internalReq: &internalRequest{