How do you encode the filename parameter of Content Disposition header in HTTP?

RFC 2183 (Content-Disposition), however, states in section 2.3 (The Filename Parameter) that the file name can only use US-ASCII characters: Current [RFC 2045] grammar restricts parameter values (and hence Content-Disposition filenames) to US-ASCII.

What is the content disposition header?

In a regular HTTP response, the Content-Disposition response header is a header indicating if the content is expected to be displayed inline in the browser, that is, as a Web page or as part of a Web page, or as an attachment, that is downloaded and saved locally.

When to use the filename parameter in content disposition?

The filename parameter can be used to suggest a name for the file into which the resource is downloaded by the browser. RFC 2183 (Content-Disposition), however, states in section 2.3 (The Filename Parameter) that the file name can only use US-ASCII characters:

Is the content disposition header used on the body?

Used on the body itself, Content-Disposition has no effect. The Content-Disposition header is defined in the larger context of MIME messages for e-mail, but only a subset of the possible parameters apply to HTTP forms and POST requests.

When to use content disposition and save as?

When used in combination with Content-Disposition: attachment, it is used as the default filename for an eventual “Save As” dialog presented to the user. filename*. The parameters “filename” and “filename*” differ only in that “filename*” uses the encoding defined in RFC 5987.

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