fix: handle non-json response body

response.go

@@ -12,7 +12,7 @@ import (
 	"github.com/httprunner/httpboomer/builtin"
 )
 
-func NewResponseObject(t *testing.T, resp *req.Resp) *ResponseObject {
+func NewResponseObject(t *testing.T, resp *req.Resp) (*ResponseObject, error) {
 	// prepare response headers
 	headers := make(map[string]string)
 	for k, v := range resp.Response().Header {
@@ -30,9 +30,8 @@ func NewResponseObject(t *testing.T, resp *req.Resp) *ResponseObject {
 	// parse response body
 	var body interface{}
 	if err := json.Unmarshal(resp.Bytes(), &body); err != nil {
-		log.Fatalf("[NewResponseObject] json.Unmarshal response body err: %v, body: %v",
-			err, string(resp.Bytes()))
-		return nil
+		// response body is not json, use raw body
+		body = string(resp.Bytes())
 	}
 
 	respObjMeta := respObjMeta{
@@ -46,15 +45,15 @@ func NewResponseObject(t *testing.T, resp *req.Resp) *ResponseObject {
 	respObjMetaBytes, _ := json.Marshal(respObjMeta)
 	var data interface{}
 	if err := json.Unmarshal(respObjMetaBytes, &data); err != nil {
-		log.Fatalf("[NewResponseObject] json.Unmarshal respObjMeta err: %v, respObjMetaBytes: %v",
+		log.Printf("[NewResponseObject] convert respObjMeta to interface{} error: %v, respObjMeta: %v",
 			err, string(respObjMetaBytes))
-		return nil
+		return nil, err
 	}
 
 	return &ResponseObject{
 		t:           t,
 		respObjMeta: data,
-	}
+	}, nil
 }
 
 type respObjMeta struct {

runner.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/imroc/req"
+	"github.com/pkg/errors"
 )
 
 // run API test with default configs
@@ -171,7 +172,11 @@ func (r *Runner) runStepRequest(step *TStep) (stepData *StepData, err error) {
 	defer resp.Response().Body.Close()
 
 	// new response object
-	respObj := NewResponseObject(r.t, resp)
+	respObj, err := NewResponseObject(r.t, resp)
+	if err != nil {
+		err = errors.Wrap(err, "init ResponseObject error")
+		return
+	}
 
 	// extract variables from response
 	extractors := step.Extract