Revert "Add content length to filer's requests (#6489)"

This reverts commit 9f42ce3f01.

weed/s3api/s3api_object_handlers_put.go

@@ -129,7 +129,6 @@ func (s3a *S3ApiServer) putToFiler(r *http.Request, uploadUrl string, dataReader
 		query.Add("collection", s3a.getCollectionName(bucket))
 		proxyReq.URL.RawQuery = query.Encode()
 	}
-	proxyReq.ContentLength = r.ContentLength
 
 	for header, values := range r.Header {
 		for _, value := range values {