diff --git a/src/request/assets.rs b/src/request/assets.rs
index 1c00dd7..236f268 100644
--- a/src/request/assets.rs
+++ b/src/request/assets.rs
@@ -107,6 +107,7 @@ impl<'r> Responder<'r, 'static> for DataResponse {
                         ))
                         .header(Header::new("Accept-Ranges", "bytes"))
                         .header(Header::new("Content-Type", self.content_type.clone()))
+                        .header(Header::new("Content-Length", sliced_data.len().to_string()))
                         .status(Status::PartialContent)
                         .streamed_body(Cursor::new(sliced_data.to_vec()))
                         .finalize());
@@ -150,6 +151,10 @@ impl<'r> Responder<'r, 'static> for DataResponse {
                         "Content-Type",
                         format!("multipart/byteranges; boundary={boundary}"),
                     ))
+                    .header(Header::new(
+                        "Content-Length",
+                        multipart_body.len().to_string(),
+                    ))
                     .status(Status::PartialContent)
                     .streamed_body(Cursor::new(multipart_body.to_vec()))
                     .finalize());