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The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. Possible values are the empty string default , "arraybuffer" , "blob" , "document" , "json" , and "text". This is null if the request is not complete or was not successful.
This example reads an image as a binary file and creates an 8-bit unsigned integer array from the raw bytes. Note that this will not decode the image and read the pixels.
You will need a png decoding library for that. An alternative to the above method utilizes the Blob interface to directly construct a Blob with the arraybuffer data. Also you can read a binary file as a Blob by setting the string "blob" to the responseType property. The magic happens in line 5, which overrides the MIME type, forcing the browser to treat it as plain text, using a user-defined character set.
This tells the browser not to parse it, and to let the bytes pass through unprocessed. The example above fetches the byte at offset x within the loaded binary data. The valid range for x is from 0 to filestream. See also downloading files. The following example creates a text file on-the-fly and uses the POST method to send the "file" to the server.
This example uses plain text, but you can imagine the data being a binary file instead. This is building a byte array of 8-bit integers and sending it; you can use any binary data you'd like, of course. Please, read this paragraph. Line 4 sets the Content-Length header to , indicating that the data is bytes long.
Add information about other browsers' support here. The standard send Blob data method can be used instead as explained above. Document Tags and Contributors Tags: Contributors to this page: Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox.