Content-Disposition API
Parse and build HTTP Content-Disposition headers (RFC 6266, with RFC 5987 filename* encoding). The parse endpoint reads a header into its disposition type (attachment, inline or form-data), its filename — correctly decoding the extended filename*=UTF-8''… form and preferring it over a plain filename exactly as the specification requires — the form-data field name, and any remaining parameters. The build endpoint assembles a correct header from simple fields and, when a filename contains non-ASCII characters (accents, emoji, CJK), automatically emits both an ASCII fallback filename and the percent-encoded filename*, so every browser shows the right download name while older clients still work. Everything is computed locally and deterministically, so it is instant and private — no file is ever fetched or stored. Ideal for file-download and upload endpoints, object storage and CDNs, content gateways and proxies, email and multipart handling, and debugging why a download is mis-named. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This builds and parses the header string itself; it does not serve a file.
api.oanor.com/contentdisposition-api
