diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 3206dd26..164235e0 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 - fix: missing setup/teardown hooks for referenced testcase
 - fix: compatibility for `black` on Android termux that does not support multiprocessing well
+- fix: mishandling of request header `Content-Length` for GET method
 
 **Changed**
 
diff --git a/httprunner/models.py b/httprunner/models.py
index 775a7a75..51264c33 100644
--- a/httprunner/models.py
+++ b/httprunner/models.py
@@ -51,8 +51,8 @@ class TRequest(BaseModel):
     url: Url
     params: Dict[Text, Text] = {}
     headers: Headers = {}
-    req_json: Union[Dict, List] = Field({}, alias="json")
-    data: Union[Text, Dict[Text, Any]] = ""
+    req_json: Union[Dict, List] = Field(None, alias="json")
+    data: Union[Text, Dict[Text, Any]] = None
     cookies: Cookies = {}
     timeout: float = 120
     allow_redirects: bool = True