Only the value form-data, as well as the optional directive name and filename, can be used in the HTTP context. 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. Used on the body itself, Content-Disposition has no effect. The subpart is delimited by the boundary defined in the Content-Type header. In a multipart/form-data body, the HTTP Content-Disposition general header is a header that must be used on each subpart of a multipart body to give information about the field it applies to. 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.
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