Octet Stream Pdf
Some scanners mail the scanned pdf file as an application/octet-stream with pdf extension. These are indeed pdf files. Currently, they are not opened as pdf, but I.
The HTTP standard says:
If this header [Content-Disposition: attachment] is used in a response with the application/octet-stream content-type, the implied suggestion is that the user agent should not display the response, but directly enter a `save response as...' dialog.
- Dear Sir, Our front page is in Angular JS and operating system Windows 7. We are using data uri = data:application/octet-stream;base64 to download the PDF.
- Hello I am integrating with Apple's GSX API's, and one of the functions allows you to download a PDF of a 'DepotShippingLabel' which we need to send faulty parts off to Apple.
I read that as
But I would have thought that Content-Type would be application/pdf, image/png, etc.
Should I have Content-Type: application/octet-stream if I want browsers to download the file?
1 Answer
No.
The content-type should be whatever it is known to be, if you know it. application/octet-stream is defined as 'arbitrary binary data' in RFC 2046, and there's a definite overlap here of it being appropriate for entities whose sole intended purpose is to be saved to disk, and from that point on be outside of anything 'webby'. Or to look at it from another direction; the only thing one can safely do with application/octet-stream is to save it to file and hope someone else knows what it's for.
You can combine the use of Content-Disposition with other content-types, such as image/png or even text/html to indicate you want saving rather than display. It used to be the case that some browsers would ignore it in the case of text/html but I think this was some long time ago at this point (and I'm going to bed soon so I'm not going to start testing a whole bunch of browsers right now; maybe later).
RFC 2616 also mentions the possibility of extension tokens, and these days most browsers recognise inline to mean you do want the entity displayed if possible (that is, if it's a type the browser knows how to display, otherwise it's got no choice in the matter). This is of course the default behaviour anyway, but it means that you can include the filename part of the header, which browsers will use (perhaps with some adjustment so file-extensions match local system norms for the content-type in question, perhaps not) as the suggestion if the user tries to save.
Hence:
Means 'I don't know what the hell this is. Please save it as a file, preferably named picture.png'.
Means 'This is a PNG image. Please save it as a file, preferably named picture.png'.
Means 'This is a PNG image. Please display it unless you don't know how to display PNG images. Otherwise, or if the user chooses to save it, we recommend the name picture.png for the file you save it as'.
Of those browsers that recognise inline some would always use it, while others would use it if the user had selected 'save link as' but not if they'd selected 'save' while viewing (or at least IE used to be like that, it may have changed some years ago).
Application Octet Stream File Extension
protected by Rachel GallenMar 15 at 8:50
Application Octet Stream Pdf
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A multipurpose internet mail extension, or MIME type, is an internet standard that describes the contents of internet files based on their natures and formats. This cataloging helps the browser open the file with the appropriate extension or plugin. Although the term includes the word “mail,” it is used for web pages, too.
MIME types contain two parts: a type and a sub-type.
- The type describes the categorization of MIME types that are linked to each other.
- In contrast, a subtype is unique to a specific file type that is part of the type.
Here is the MIME type for HTML:
MIME types are defined in HTML by the
Octet Stream Files
Distinguishing Among MIME Types
Following is a list of most MIME types, with their file extensions and the applications that use them. Many computers use file extensions to help identify file types. So, if you have a file with an odd extension on your website, you can look up the MIME type in this list.
Some types are prefixed with X, and some are prefixed with VND. These prefixes, respectively, refer to sub-types not listed with the Internet Assigned Numbers Authority or values specific to a vendor.