go changedcli-sdks-libraries/sdks/go
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543543Request parameters that correspond to file uploads in multipart requests are typed as `io.Reader`. The contents of the `io.Reader` are sent by default as a multipart form part with the file name of `anonymous_file` and content type of `application/octet-stream`, so the recommended approach is to specify a custom content type with the `anthropic.File(reader io.Reader, filename string, contentType string)` helper, which wraps any `io.Reader` with the appropriate file name and content type.
544544
545545```go
546// A file from the file system
546// A file from the filesystem
547547file, err := os.Open("/path/to/file.json")
548548anthropic.FileUploadParams{
549549 File: anthropic.File(file, "custom-name.json", "application/json"),
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