HTTPS POST in shift-jis encoding - node.js

Question

I'm trying to send a POST request to a server which decodes with SHIFT-JIS.
This string サービス is being translated to 繧ｵ繝ｼ繝薙せ after being decoded in SHIFT-JIS.
It seems like the request will always be encoded in UTF-8 whenever the request is being sent over.
I'm using nodejs for posting the request.
Question is how do I send over the characters in shift-jis encoding? It seemed easy but I just couldn't find out how to.
Listening server
var iconv = require('iconv-lite');
const http = require('http');
http.createServer((request, response) =>
{
const
{
headers,
method,
url
} = request;
let body = [];
request.on('error', (err) =>
{
console.error(err);
}
).on('data', (chunk) =>
{
body.push(chunk);
}
).on('end', () =>
{
body = Buffer.concat(body).toString();
// BEGINNING OF NEW STUFF
body = iconv.decode(Buffer.from(body), 'shift_jis');
response.on('error', (err) =>
{
console.error(err);
}
);
response.statusCode = 200;
response.setHeader('Content-Type', 'application/json');
// Note: the 2 lines above could be replaced with this next one:
// response.writeHead(200, {'Content-Type': 'application/json'})
const responseBody =
{
headers,
method,
url,
body
};
response.write(JSON.stringify(responseBody));
console.log(body);
console.log(responseBody);
response.end();
// Note: the 2 lines above could be replaced with this next one:
// response.end(JSON.stringify(responseBody))
// END OF NEW STUFF
}
);
}
).listen(8000);
Request
var request = require('request');
request({
url: 'http://localhost:8000',
headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=shift_jis' },
method: 'POST',
body: 'サービス'
}, function(error, response, body){
if(error) {
console.log(error);
} else {
console.log(response.statusCode, body);
}
});
EDIT: It turns out that the axios module we're using for HTTPS POST will encode the payload in UTF-8 before sending out the request. We cloned the axios module and modifying it to encode in SHIFT-JIS instead.

Answer 1

If you want to send a string with Shift-JIS encoding, you have to convert the target string (it is represented in UTF-16 internally) into Shift-JIS before adding it into the request body.
The standard TextEncoder only supports UTF-8 encoding and cannot handle Shift-JIS encoding. So you have to use additional modules like encoding.js or text-encoding for this purpose.