fix: post form data

examples/demo.json

@@ -100,7 +100,10 @@
             "request": {
                 "method": "POST",
                 "url": "/post",
-                "params": {
+                "headers": {
+                    "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8"
+                },
+                "body": {
                     "foo1": "$varFoo1",
                     "foo2": "${max($a, $b)}"
                 }

examples/demo.yaml

@@ -67,7 +67,9 @@ teststeps:
       request:
         method: POST
         url: /post
-        params:
+        headers:
+            Content-Type: application/x-www-form-urlencoded; charset=UTF-8
+        body:
             foo1: $varFoo1
             foo2: ${max($a, $b)}
       validate:

examples/demo_test.go

@@ -49,6 +49,7 @@ func TestCaseDemo(t *testing.T) {
 				AssertEqual("body.json.foo2", 12.3, "check args foo2"),
 			hrp.Step("post form data").
 				POST("/post").
+				WithHeaders(map[string]string{"Content-Type": "application/x-www-form-urlencoded; charset=UTF-8"}).
 				WithParams(map[string]interface{}{
 					"foo1": "$varFoo1",       // reference former extracted variable
 					"foo2": "${max($a, $b)}", // 12.3; step level variables are independent, variable b is 3.45 here