Cloudflare Developers•4mo ago

Can I pre-compress a file to provide a Content-Length header?

As taken from https://community.cloudflare.com/t/no-content-length-header-when-content-type-gzip/492964/2 it appears Content-Length is generally unavailable for cloudflare pages objects as they are transparently compressed and delievered without knowing the final size of the content. I have a rather large WASM file that I'm wanting to display a loading bar for as it is downloaded to a browser from cloudflare pages. While I could likely (?) solve this by disabling compression for the file, the savings from compressing it are quite significant. Is it possible that I could precompress the file with brotli and provide the headers like so? _headers

myfile.wasm.br
  Content-Type: application/wasm
  Content-Encoding: br
  Content-Length: <size_of_brotli_file>

myfile.wasm.br
  Content-Type: application/wasm
  Content-Encoding: br
  Content-Length: <size_of_brotli_file>

If I do this-- will I get a Content-Length response for that file from Cloudflare Pages? Thanks!

2 Replies

XangelixOP•4mo ago

This appears to work fine-- but provides the file only as wasm.br. So I must download an additional dependency to decompress the wasm in my javascript code. If I instead just name the file myfile.wasm and set the headers for that instead, it seems to not respect the headers any longer. I get no Content-Length header and given that I cannot run the wasm download, and I get magic number errors: expected magic word 00 61 73 6d, found cf ff ff 7f @+0-- it appears to be recompressed on cloudflare's side, and only one layer is decompressed by my browser.

niclim•3w ago

facing this same problem? Did you managed to solve it?

Gaming

Programming

Can I pre-compress a file to provide a Content-Length header?