diff --git a/src/lib.rs b/src/lib.rs
index 0b21fbb..3a362b3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -242,15 +242,9 @@ impl Client {
         let params = params.or(self.params.clone());
         let cookies = cookies.or(self.cookies.clone());
         // Converts 'data' (if any) into a URL-encoded string for sending the data as `application/x-www-form-urlencoded` content type.
-        let data_str = data
-            .map(|data_pydict| url_encode(py, Some(data_pydict)).ok())
-            .unwrap_or_else(|| None);
+        let data_str = data.map(|data| url_encode(py, &data.clone().unbind())).transpose()?;
         // Converts 'json' (if any) into a JSON string for sending the data as `application/json` content type.
-        let json_str = json                                                                                                                                                                                               
-            .map(|json_pydict| {                                                                                                                                                                                          
-                json_dumps(py).call1((json_pydict.clone().unbind(),)).unwrap().extract::<String>().ok()                                                                                                                             
-            })                                                                                                                                                                                                            
-            .unwrap_or(None);
+        let json_str = json.map(|pydict| json_dumps(py, &pydict.clone().unbind())).transpose()?;
 
         let future = async move {
             // Check if method is POST || PUT || PATCH
diff --git a/src/response.rs b/src/response.rs
index 8f4b9b1..5932978 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -78,9 +78,7 @@ impl Response {
     }
 
     fn json(&mut self, py: Python) -> Result<PyObject> {
-        let result = json_loads(py)
-            .call1((&self.content,))?
-            .extract::<PyObject>()?;
+        let result = json_loads(py, &self.content)?;
         Ok(result)
     }
 
diff --git a/src/utils.rs b/src/utils.rs
index 352dc39..5788662 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -5,15 +5,15 @@ use anyhow::Result;
 use indexmap::IndexMap;
 use pyo3::prelude::*;
 use pyo3::sync::GILOnceCell;
-use pyo3::types::{PyBool, PyDict};
+use pyo3::types::{PyBool, PyBytes, PyDict};
 
 static JSON_DUMPS: GILOnceCell<Py<PyAny>> = GILOnceCell::new();
 static JSON_LOADS: GILOnceCell<Py<PyAny>> = GILOnceCell::new();
 static URLLIB_PARSE_URLENCODE: GILOnceCell<Py<PyAny>> = GILOnceCell::new();
 
 /// python json.dumps
-pub fn json_dumps(py: Python<'_>) -> &Bound<'_, PyAny> {
-    JSON_DUMPS
+pub fn json_dumps(py: Python<'_>, pydict: &Py<PyDict>) -> Result<String> {
+    let json_dumps = JSON_DUMPS
         .get_or_init(py, || {
             py.import_bound("json")
                 .unwrap()
@@ -21,12 +21,14 @@ pub fn json_dumps(py: Python<'_>) -> &Bound<'_, PyAny> {
                 .unwrap()
                 .unbind()
         })
-        .bind(py)
+        .bind(py);
+    let result = json_dumps.call1((pydict,))?.extract::<String>()?;
+    Ok(result)
 }
 
 /// python json.loads
-pub fn json_loads(py: Python<'_>) -> &Bound<'_, PyAny> {
-    JSON_LOADS
+pub fn json_loads(py: Python<'_>, content: &Py<PyBytes>) -> Result<PyObject> {
+    let json_loads = JSON_LOADS
         .get_or_init(py, || {
             py.import_bound("json")
                 .unwrap()
@@ -34,11 +36,13 @@ pub fn json_loads(py: Python<'_>) -> &Bound<'_, PyAny> {
                 .unwrap()
                 .unbind()
         })
-        .bind(py)
+        .bind(py);
+    let result = json_loads.call1((content,))?.extract::<PyObject>()?;
+    Ok(result)
 }
 
 /// python urllib.parse.urlencode
-pub fn url_encode(py: Python, pydict: Option<&Bound<'_, PyDict>>) -> Result<String> {
+pub fn url_encode(py: Python, pydict: &Py<PyDict>) -> Result<String> {
     let urlencode = URLLIB_PARSE_URLENCODE
         .get_or_init(py, || {
             py.import_bound("urllib.parse")
@@ -48,11 +52,9 @@ pub fn url_encode(py: Python, pydict: Option<&Bound<'_, PyDict>>) -> Result<Stri
                 .unbind()
         })
         .bind(py);
-
     let result: String = urlencode
         .call1((pydict, ("doseq", py.get_type_bound::<PyBool>().call1(())?)))?
         .extract()?;
-
     Ok(result)
 }