Data Application Octet Stream
I'm trying to send a HTTP POST to a device on my network. I want to send four specific bytes of data to the device unfortunately I only seem to be able to send strings to the device. Is there anyway to send raw binary using javascript?
Data Application Octet Stream Base64
Here's the script I'm using to do the POST, it currently doesn't run unless I put a string in the data field. Any ideas?
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4 Answers
By default, jQuery serializes the data (passed in data property) - and it means 0xFD008001number gets passed to the server as '4244668417' string (10 bytes, not 4), that's why the server treats it not as expected.
It's necessary to prevent such behaviour by setting $.ajax property processData to false:
By default, data passed in to the data option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type 'application/x-www-form-urlencoded'. If you want to send a DOMDocument, or other non-processed data, set this option to false.
.. but that's only part of the whole story: XMLHttpRequest.send implementation has its own restrictions. That's why your best bet, I suppose, is to make your own serializer using TypedArrays:
Or without using jQuery at all:
You can send binary data via ajax with xhr2, you can send the data as a typed array or a blob.
You could use atob() and btoa():
This converts your binary data into a base64 string that can be sent as text.
Application Octet Stream Files
You can convert your data with type of ArrayBuffer to a ArrayBufferView like this:
With this you wont get a warning in the console when sending fileContent.
