OFT file in Spring response entity mimetype

Question

I am writing a Spring Rest service which will have to return a file with extension .oft (ex Like Sample.oft)

This oft file will be opened in Microsoft outlook application. But I don't find any specific MimeType to set in ResponseEntity object.

If I need create custom mime type, how do I implement it?

Else is there any other file extension I can use? (.eml extension does not work either)

Answer 1

Mime-Type for OFT

Microsoft Outlook Email Template (.oft) has basically the same format as .msg. It's proven that Outlook Emails (.msg) are associated properly by following Mime-Type:

application/vnd.ms-outlook

So I would suggest to use this Mime-Type, because will ensure:

• file is application specific
• file should be handled by vendor or application (vnd) MS Outlook

File Response using Spring

See Baeldung's tutorial Download an Image or a File with Spring MVC:

@GetMapping(
  value = "/download-oft",
  produces = "application/vnd.ms-outlook"
)
public @ResponseBody byte[] getFile() throws IOException {
    InputStream in = getClass()
      .getResourceAsStream("/path/to/your/email_template.oft");
    return IOUtils.toByteArray(in);
}

Note: Above implementation uses Apache's IOUtils.

See also: Downloading a file from spring controllers