Is it possible to use a different format other than JSON or XML when making requests in JavaScript?
Can I request custom text or binary data instead?
Or are the options limited to just JSON and XML?
I'm curious to know...
a) How can I send a request without using XML or JSON?
b) Is there a way to receive the response as a plain string instead of an object?
A simple solution is to specify the content-type in the XMLHttpRequest header:
let req = new XMLHttpRequest();
req.setRequestHeader("Content-Type", "text/plain;charset=UTF-8"); // set your desired character set here.
req.open("GET", "yourtext.txt", true);
req.onreadystatechange = function() {
if(this.readyState == 2) {
alert(req.responseText);
}
}
req.send();
Feel free to utilize various text-based formats such as XML, JSON, CSV, or simply text/plain.
I'm uncertain about the outcome when attempting to use a binary format.
Retrieving the outcome can be done in various ways:
Certain browsers are even capable of returning it as an object if the data was in JSON format.
The option to obtain any content as a string gives you the flexibility to parse different formats on your own.
To ensure the content type is set to plain text, you can explicitly define it before using the send() method:
var httpRequest = new XMLHttpRequest();
httpRequest.open("POST", "/test.php");
httpRequest.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
httpRequest.send(content);
Aside from the previous mentions of the setRequestHeader function, it appears that according to the w3 specifications for the xmlhttprequest API, there are suggestions or constraints on the type of data passed in as headers (the first argument) but not for the actual values themselves (the second argument).
You can find the full specification here: http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method.
Based on my understanding, this means that any data type is acceptable for the requested transfer, but when it comes to the returned data, only text and xml formats are specified.
Of course, I could be mistaken in my interpretation.
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