Application Octet Stream

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About 'application/octet-stream' MIME attachments. A MIME attachment with the content type 'application/octet-stream' is a binary file.Typically, it will be an. Content type 'application/octet-stream' will always cause Firefox to show the 'open with' download dialog. To avoid this download you would have to configure the.

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Application octet stream not supportedFirefox

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commented May 2, 2017

My understanding is that the Java SDK sets by default a Content-Type: application/octet-stream header if none is provided by the user when adding an object.
https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/AmazonS3Client.java#L4147

On the other hand, I've noticed that files uploaded via AWS CLI's s3api put-object .. get assigned a Content-Type of binary/octet-stream.
I suppose that this value is assigned by the S3 backend, because I couldn't find any Content-Type header set in the PUT request according to --debug logs.

Uploading a file via the S3 Web console produces a binary/octet-stream MIME type as well.
(For the record, Google Cloud Storage also uses binary/octet-stream.)

I was wondering if you had any comment on this difference between application/octet-stream and binary/octet-stream?

referenced this issue May 2, 2017

Merged

[MODE-2692] Return null MIME type in case of 'application/octet-stream' #1656

commented May 2, 2017

Hi don't believe the CLI actually sets binary/octet-stream. You can verify this by issuing a command like aws s3 cp MY_BINARY_FILE s3://MY_BUCKET --debug and see that it does not send a Content-Type header.

Per the S3 docs, the default is binary/octet-stream if the header is not set: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html

commented May 2, 2017

Oops sorry looks like I didn't read your question close enough! I'm not sure what the exact reason is for the discrepancy but I suspect it's because application/octet-stream is registered with the IANA, and binary/octet-stream does not seem to be. In any case, I don't think it's possible for us to change this now because it would be subtle breaking change for customers.

Application/octet-stream

commented May 3, 2017

Hum, if the default behavior can't be changed (what kind of 'subtle change' do you expect by the way?), what about an option to specify the default MIME type?
Or is the only solution for the API user to explicitly set binary/octet-stream for each PUT operation?

commented May 3, 2017

As far as breaking change, customers may be relying on the fact that the default MIME for objects uploaded using the Java SDK to be application/octet-stream rather than binary/octet-stream.

Do you expect all of your objects to have binary/octet-stream? If so, you can use ClientConfiguration#withHeader. Note that this will override the value set on ObjectMetadata#setContentType so it won't work if the you need to be able to override the default value.

Fonelab free trial free. Another option might be a custom RequestHandler

We can also look into adding a default object MIME if that would be easiest for you.

Application Octet Stream

commented May 3, 2017

Thanks for the tips on the various methods available.
I have full control of the code that uses the API so I can explicitly use ObjectMetadata#setContentType for each call, that's not a big deal.
Yet, I am curious what you meant in your last sentence.

commented May 3, 2017
edited

Are you referring to

We can also look into adding a default object MIME if that would be easiest for you.

?

I was imagining just a new option like setDefaultObjectMimeType on S3ClientOptions that works sort of like ClientConfiguration#withHeader but at the S3 level so you can change mimetype per PUT call.

commented May 3, 2017

Yes, I think such an option would be useful. That would even give some API visibility to the fact that the Java SDK uses a 'non-standard' default MIME type.

commented May 4, 2017

By the way, speaking of 'application/octet-stream' header, I saw in debug traces that (all?) HTTP requests sent to S3 contain such a header, even in case of a GET or HEAD.
I suppose that's not forbidden per se according to the spec, but I find it strange.

Application Octet Stream Download

assigned dagnirMay 15, 2017

referenced this issue Jan 13, 2019

Open

Crash when guess_extension() returns None #37

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Did your computer fail to open an OCTET-STREAM file? We explain what OCTET-STREAM files are and recommend software that we know can open or convert your OCTET-STREAM files.

What is an OCTET-STREAM file?

The OCTET-STREAM format is used for file attachments on the Web with an unknown file type. These .octet-stream files are arbitrary binary data files that may be in any multimedia format. The OCTET-STREAM format was developed for Web browsers to understand that the file attachment is in an unknown file type, which also allows the user to choose to download and save the attached file in any file format that the user wants.

In other instances, the OCTET-STREAM file format is used to inform the user that the attached file may be saved in a recommended file format. This also allows the Web browser to enable the user to know the recommended file format for the attached .octet-stream file.

Application Octet Stream

These OCTET-STREAM files may be opened by renaming the extension of the attached file to a specific file extension, and then by using an application with support for opening such files. For example, an .octet-stream file may be renamed to a .txt file (if it is indeed a .txt file), and Notepad may then be used to open the file. This means the user needs to know the file type of the attached .octet-stream file before renaming the file in the correct file extension.

Software that will open, convert or fix OCTET-STREAM files

Unfortunately we have not received enough suggestions for software that can open OCTET-STREAM files yet.

Try a universal file viewer

I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.

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