diff --git a/middleware.go b/middleware.go
index 64573d0d..a0ba0700 100644
--- a/middleware.go
+++ b/middleware.go
@@ -196,6 +196,10 @@ func parseRequestBody(c *Client, r *Request) error {
 			}
 		case len(c.FormData) > 0 || len(r.FormData) > 0: // Handling Form Data
 			handleFormData(c, r)
+		case r.Body == nil && r.bodyBuf == nil: // Handling Request body when nil body
+			// Go http library omits Content-Length if body is nil; use http.NoBody to force it if SetContentLength is true
+			r.Body = http.NoBody
+			fallthrough
 		case r.Body != nil: // Handling Request body
 			handleContentType(c, r)
 
@@ -315,6 +319,7 @@ func createCurlCmd(c *Client, r *Request) (err error) {
 		}
 		*r.resultCurlCmd = buildCurlRequest(r.RawRequest, c.httpClient.Jar)
 	}
+
 	return nil
 }
 
diff --git a/middleware_test.go b/middleware_test.go
index d85514e6..b4c57db8 100644
--- a/middleware_test.go
+++ b/middleware_test.go
@@ -513,6 +513,7 @@ func Test_parseRequestBody(t *testing.T) {
 				r.SetContentLength(true)
 			},
 			expectedContentLength: "0",
+			expectedBodyBuf:       []byte{},
 		},
 		{
 			name: "empty body with SetContentLength by client",
@@ -520,6 +521,7 @@ func Test_parseRequestBody(t *testing.T) {
 				c.SetContentLength(true)
 			},
 			expectedContentLength: "0",
+			expectedBodyBuf:       []byte{},
 		},
 		{
 			name: "string body",
diff --git a/request_test.go b/request_test.go
index 00127d33..0d61e666 100644
--- a/request_test.go
+++ b/request_test.go
@@ -2283,3 +2283,27 @@ func TestRequestGH917(t *testing.T) {
 	}
 	wg.Wait()
 }
+
+func TestSetContentLengthTrueWithNilBody(t *testing.T) {
+	ts := createPostServer(t)
+	defer ts.Close()
+
+	c := dc()
+
+	c.OnBeforeRequest(func(client *Client, request *Request) error {
+		request.
+			SetBody(nil).
+			SetContentLength(true)
+
+		return nil
+	})
+
+	c = c.SetBaseURL(ts.URL)
+
+	resp, err := c.R().Execute("POST", "/check-request-content-length")
+
+	assertNil(t, err)
+
+	// when body is nil and SetContentLength is true expect Content-Length == "0"
+	assertEqual(t, "0", resp.Header().Get("Request-Content-Length"))
+}
diff --git a/resty_test.go b/resty_test.go
index 7637c4bb..2df4176a 100644
--- a/resty_test.go
+++ b/resty_test.go
@@ -326,6 +326,10 @@ func createPostServer(t *testing.T) *httptest.Server {
 				}
 				http.SetCookie(w, &cookie)
 				w.WriteHeader(http.StatusOK)
+			case "/check-request-content-length":
+				// test endpoint for checking the server receives the correct Content-Length Header from a request
+				w.Header().Add("Request-Content-Length", r.Header.Get("Content-Length"))
+				w.WriteHeader(http.StatusOK)
 			}
 		}
 	})