Remove custom headers and unnecessary adjustment of content-length

lib/network.js

@@ -33,17 +33,10 @@ const intToIp = (int) => {
   return octets.join('.');
 };
 
-const customHeaders = ({ headers = {}, body }) => {
-  const mimeType = 'application/json';
-  const custom = { 'Content-Type': mimeType, ...headers };
-  if (body) custom['Content-Length'] = Buffer.byteLength(body);
-  return custom;
-};
-
 const httpApiCall = async (url, { method = 'POST', headers = {}, body }) => {
-  const custom = customHeaders({ headers, body });
-  const options = { method, headers: custom, body };
-  return await fetch(url, options).then((res) => {
+  const mimeType = 'application/json';
+  headers['Content-Type'] = mimeType;
+  return await fetch(url, { method, headers, body }).then((res) => {
     const code = res.status;
     if (code === 200) return res.json();
     const dest = `for ${method} ${url}`;
@@ -56,5 +49,4 @@ module.exports = {
   ipToInt,
   intToIp,
   httpApiCall,
-  customHeaders,
 };