Hi all, OK, I think we've gotten some good ideas, I'd like to make some concrete proposals based on everyone's input: * Warp should be modified to perform the stat() system call to get the content-length when none is provided. * In order to avoid the system call twice, we will pass the content-length (wherever it comes from) to simple-sendfile. * wai-app-static and yesod-static are being updated to support embedded files. It's unclear if that will be a speed gain versus filesystem serving, because: * Filesystem serving gets to use sendfile, which skips a memory copy from user space to kernel space * On the other hand, embedded serving avoids touching the hard drive... * But the file may be cached * (Not yet discussed): In addition to sendFile, let's provide a sendEmbeddedFile function * And let's make sure all this information is reflected in the docs. Any thoughts? Michael