Can Go's `http.ServeContent` Efficiently Handle Partial Content Requests?

Serving Partial Content with Go

Serving partial content is a technique that allows webservers to efficiently handle requests for only a portion of a file. This is particularly useful for audio and video streaming, where the user may only need to buffer a small section of the content.

Can Go's default functions achieve this?

Go's http.ServeContent function supports partial content under certain conditions. However, it requires that the content be served from a file, which may not be feasible when pulling files from various sources.

Serving Partial Content Manually

To serve partial content manually, you can use the following strategy:

1. Implement io.ReadSeeker: Your content must be accessible as an io.ReadSeeker, an interface that allows seeking and reading from the content. This can be achieved using:

   • bytes.Reader if the content is held as a byte slice
   • A custom type that implements io.ReadSeeker if the content is not stored as a file
2. Use http.ServeContent: Pass the io.ReadSeeker to http.ServeContent along with the name, modification time, and content length. http.ServeContent will handle the partial content headers and requests appropriately.

By following these steps, you can enable partial content serving in your Go application without relying on external libraries or frameworks.

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