I am uploading files to FirebaseStorage and i am getting this error on iOS :

Task <24E18897-20B7-45FD-9621-85FF09DC6326>.<1> finished with error [-1017] Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" UserInfo={_kCFStreamErrorCodeKey=-1, _NSURLErrorFailingURLSessionTaskErrorKey=BackgroundUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "BackgroundUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>",
    "LocalUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>"
), NSLocalizedDescription=cannot parse response, _kCFStreamErrorDomainKey=4, NSErrorFailingURLStringKey=https://firebasestorage.googleapis.com/v0/b/mybucket/o/user%2FNyq7dMqe1kcAZ77R1YwH5fsAkV83%2Fcontent%2F43aa2d41-7a19-11ec-bd39-85fcd9d025?uploadType=resumable&name=user%2FNqe1kcAZ77R1YwH5fsAkV83%2Fcontent%2F43aa2d41-7a19-11ec-bd39-8508fcd025&upload_id=ADPycdv0-OYZPx3zAGzLrn25ZdI9srgkgABHGKb_1fCqUO7AAPHsZTkz_iVX1NfuYQsn0LHgCCiOsSzhLiP4Ho7VynSf_ceJJw&upload_protocol=resumable, NSErrorFailingURLKey=https://firebasestorage.googleapis.com/v0/b/mybucket/o/user%2FNyqMqe1kcAZ77R1YwH5fsAkV83%2Fcontent%2F43aa2d41-7a19-11ec-bd39-8508fcd9d025?uploadType=resumable&name=user%2FNyq7dMqe1kcAZ77R1YwH5V83%2Fcontent%2F432d41-7a19-11ec-bd39-8508f9d025&upload_id=ADPycdv0-OYZPx3zAGzLrn25ZdI9srgkgABHGKb_1fCqUO7AAPHsZTkz_iVX1NfuYQsn0LHgCCiOsSzhLiP4Ho7VynSf_ceJJw&upload_protocol=resumable}
GTMSessionFetcher invoking fetch callbacks, data (null), error Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" UserInfo={_kCFStreamErrorCodeKey=-1, _NSURLErrorFailingURLSessionTaskErrorKey=BackgroundUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "BackgroundUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>",
    "LocalUploadTask <24E18897-20B7-45FD-9621-85FF09DC6326>.<1>"
), NSLocalizedDescription=cannot parse response, _kCFStreamErrorDomainKey=4, NSErrorFailingURLStringKey=https://firebasestorage.googleapis.com/v0/b/mybucket/o/users%2FNyq7dMqe1kcAZ77R1YwH5fsAkV83%2Fcontent%2F43aa2d41-7a19-11ec-bd39-8508fcd9d025?uploadType=resumable&name=users%2FNyq7dMqe1kcAZ77R1YwH5fsAkV83%2Fposts%2F43aa2d41-7a19-11ec-bd39-8508fcd9d025s&upload_id=ADPycdv0-OYZPx3zAGzLrn25ZdI9srgkgABHGKb_1fCqUO7AAPHsZTkz_iVX1NfuYQsn0LHgCCiOsSzhLiP4Ho7VynSf_ceJJw&upload_protocol=resumable, NSErrorFailingURLKey=https://firebasestorage.googleapis.com/v0/b/mybucket/o/user%2FNyq7dMqe1kcAZ77R1YwH5fsAkV83%2Fcontent%2F43aa2d41-7a19-11ec-bd39-8508fcd9d025-low_res?uploadType=resumable&name=user%2FNyq7dMqe1kcAZ77R1YwH5fsAkV83%2Fposts%2F43aa2d41-7a19-11ec-bd39-8508f&upload_id=ADPycdv0-OYZPx3zAGzLrn25ZdI9srgkgABHGKb_1fCqUO7AAPHsZTkz_iVX1NfuYQsn0LHgCCiOsSzhLiP4Ho7VynSf_ceJJw&upload_protocol=resumable}

This result in a [firebase_storage/unknown] An unknown error occurred, please check the server response.
But this time i can see the iOS failure, not the server response unfortunately...

So what does Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" mean and how to fix it please ?

Note : I have seen this question but it's not really something i can fix myself as i am using the Firebase iOS SDK...

EDIT :

I have opened an issue and a case in Firebase Support to get more information about this as no one seem to have some for now unfortunately.
This is probably a bug server-side as i can't reproduce it 100% of the time and the error is also not useful for debug.

EDIT 2 :

Firebase support was able to reproduce this issue with quite low internet connections, but in my case this happens also with normal connectivity.
I have also set the metadata specifying the content-type to avoid an extra "parsing" server side but it didn't change anything unfortunately.