diff --git a/internals/proxy/middlewares/mapping.go b/internals/proxy/middlewares/mapping.go
index 5f47666..53f7a01 100644
--- a/internals/proxy/middlewares/mapping.go
+++ b/internals/proxy/middlewares/mapping.go
@@ -61,9 +61,14 @@ func mappingHandler(next http.Handler) http.Handler {
 		if modifiedBody {
 			body.Data = bodyData
 
-			log.Debug("Applied Data Aliasing: ", body.Data)
+			err := body.Write(req)
+
+			if err != nil {
+				http.Error(w, "Internal Error", http.StatusInternalServerError)
+				return
+			}
 
-			body.Write(req)
+			log.Debug("Applied Data Aliasing: ", body.Data)
 		}
 
 		next.ServeHTTP(w, req)
diff --git a/internals/proxy/middlewares/message.go b/internals/proxy/middlewares/message.go
index eb62451..481c216 100644
--- a/internals/proxy/middlewares/message.go
+++ b/internals/proxy/middlewares/message.go
@@ -60,9 +60,14 @@ func messageHandler(next http.Handler) http.Handler {
 		if modifiedBody {
 			body.Data = bodyData
 
-			log.Debug("Applied Message Templating: ", body.Data)
+			err := body.Write(req)
+
+			if err != nil {
+				http.Error(w, "Internal Error", http.StatusInternalServerError)
+				return
+			}
 
-			body.Write(req)
+			log.Debug("Applied Message Templating: ", body.Data)
 		}
 
 		next.ServeHTTP(w, req)
diff --git a/internals/proxy/middlewares/template.go b/internals/proxy/middlewares/template.go
index 633ddb4..9ab980d 100644
--- a/internals/proxy/middlewares/template.go
+++ b/internals/proxy/middlewares/template.go
@@ -72,9 +72,14 @@ func templateHandler(next http.Handler) http.Handler {
 		if modifiedBody {
 			body.Data = bodyData
 
-			log.Debug("Applied Body Templating: ", body.Data)
+			err := body.Write(req)
 
-			body.Write(req)
+			if err != nil {
+				http.Error(w, "Internal Error", http.StatusInternalServerError)
+				return
+			}
+
+			log.Debug("Applied Body Templating: ", body.Data)
 		}
 
 		if req.URL.Path != "" {
diff --git a/utils/request/request.go b/utils/request/request.go
index d068e79..8dd8514 100644
--- a/utils/request/request.go
+++ b/utils/request/request.go
@@ -30,7 +30,15 @@ func (body Body) ToString() string {
 	return string(body.Raw)
 }
 
-func (body Body) Write(req *http.Request) {
+func (body *Body) Write(req *http.Request) error {
+	newBody, err := CreateBody(body.Data)
+
+	if err != nil {
+		return err
+	}
+
+	body = &newBody
+
 	bodyLength := len(body.Raw)
 
 	if req.ContentLength != int64(bodyLength) {
@@ -39,6 +47,8 @@ func (body Body) Write(req *http.Request) {
 	}
 
 	req.Body = io.NopCloser(bytes.NewReader(body.Raw))
+
+	return nil
 }
 
 func CreateBody(data map[string]any) (Body, error) {