chore: add project dependencies and configuration files

Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.

node_modules/axios/lib/adapters/xhr.js

@@ -0,0 +1,197 @@
+import utils from './../utils.js';
+import settle from './../core/settle.js';
+import transitionalDefaults from '../defaults/transitional.js';
+import AxiosError from '../core/AxiosError.js';
+import CanceledError from '../cancel/CanceledError.js';
+import parseProtocol from '../helpers/parseProtocol.js';
+import platform from '../platform/index.js';
+import AxiosHeaders from '../core/AxiosHeaders.js';
+import {progressEventReducer} from '../helpers/progressEventReducer.js';
+import resolveConfig from "../helpers/resolveConfig.js";
+
+const isXHRAdapterSupported = typeof XMLHttpRequest !== 'undefined';
+
+export default isXHRAdapterSupported && function (config) {
+  return new Promise(function dispatchXhrRequest(resolve, reject) {
+    const _config = resolveConfig(config);
+    let requestData = _config.data;
+    const requestHeaders = AxiosHeaders.from(_config.headers).normalize();
+    let {responseType, onUploadProgress, onDownloadProgress} = _config;
+    let onCanceled;
+    let uploadThrottled, downloadThrottled;
+    let flushUpload, flushDownload;
+
+    function done() {
+      flushUpload && flushUpload(); // flush events
+      flushDownload && flushDownload(); // flush events
+
+      _config.cancelToken && _config.cancelToken.unsubscribe(onCanceled);
+
+      _config.signal && _config.signal.removeEventListener('abort', onCanceled);
+    }
+
+    let request = new XMLHttpRequest();
+
+    request.open(_config.method.toUpperCase(), _config.url, true);
+
+    // Set the request timeout in MS
+    request.timeout = _config.timeout;
+
+    function onloadend() {
+      if (!request) {
+        return;
+      }
+      // Prepare the response
+      const responseHeaders = AxiosHeaders.from(
+        'getAllResponseHeaders' in request && request.getAllResponseHeaders()
+      );
+      const responseData = !responseType || responseType === 'text' || responseType === 'json' ?
+        request.responseText : request.response;
+      const response = {
+        data: responseData,
+        status: request.status,
+        statusText: request.statusText,
+        headers: responseHeaders,
+        config,
+        request
+      };
+
+      settle(function _resolve(value) {
+        resolve(value);
+        done();
+      }, function _reject(err) {
+        reject(err);
+        done();
+      }, response);
+
+      // Clean up request
+      request = null;
+    }
+
+    if ('onloadend' in request) {
+      // Use onloadend if available
+      request.onloadend = onloadend;
+    } else {
+      // Listen for ready state to emulate onloadend
+      request.onreadystatechange = function handleLoad() {
+        if (!request || request.readyState !== 4) {
+          return;
+        }
+
+        // The request errored out and we didn't get a response, this will be
+        // handled by onerror instead
+        // With one exception: request that using file: protocol, most browsers
+        // will return status as 0 even though it's a successful request
+        if (request.status === 0 && !(request.responseURL && request.responseURL.indexOf('file:') === 0)) {
+          return;
+        }
+        // readystate handler is calling before onerror or ontimeout handlers,
+        // so we should call onloadend on the next 'tick'
+        setTimeout(onloadend);
+      };
+    }
+
+    // Handle browser request cancellation (as opposed to a manual cancellation)
+    request.onabort = function handleAbort() {
+      if (!request) {
+        return;
+      }
+
+      reject(new AxiosError('Request aborted', AxiosError.ECONNABORTED, config, request));
+
+      // Clean up request
+      request = null;
+    };
+
+    // Handle low level network errors
+    request.onerror = function handleError() {
+      // Real errors are hidden from us by the browser
+      // onerror should only fire if it's a network error
+      reject(new AxiosError('Network Error', AxiosError.ERR_NETWORK, config, request));
+
+      // Clean up request
+      request = null;
+    };
+
+    // Handle timeout
+    request.ontimeout = function handleTimeout() {
+      let timeoutErrorMessage = _config.timeout ? 'timeout of ' + _config.timeout + 'ms exceeded' : 'timeout exceeded';
+      const transitional = _config.transitional || transitionalDefaults;
+      if (_config.timeoutErrorMessage) {
+        timeoutErrorMessage = _config.timeoutErrorMessage;
+      }
+      reject(new AxiosError(
+        timeoutErrorMessage,
+        transitional.clarifyTimeoutError ? AxiosError.ETIMEDOUT : AxiosError.ECONNABORTED,
+        config,
+        request));
+
+      // Clean up request
+      request = null;
+    };
+
+    // Remove Content-Type if data is undefined
+    requestData === undefined && requestHeaders.setContentType(null);
+
+    // Add headers to the request
+    if ('setRequestHeader' in request) {
+      utils.forEach(requestHeaders.toJSON(), function setRequestHeader(val, key) {
+        request.setRequestHeader(key, val);
+      });
+    }
+
+    // Add withCredentials to request if needed
+    if (!utils.isUndefined(_config.withCredentials)) {
+      request.withCredentials = !!_config.withCredentials;
+    }
+
+    // Add responseType to request if needed
+    if (responseType && responseType !== 'json') {
+      request.responseType = _config.responseType;
+    }
+
+    // Handle progress if needed
+    if (onDownloadProgress) {
+      ([downloadThrottled, flushDownload] = progressEventReducer(onDownloadProgress, true));
+      request.addEventListener('progress', downloadThrottled);
+    }
+
+    // Not all browsers support upload events
+    if (onUploadProgress && request.upload) {
+      ([uploadThrottled, flushUpload] = progressEventReducer(onUploadProgress));
+
+      request.upload.addEventListener('progress', uploadThrottled);
+
+      request.upload.addEventListener('loadend', flushUpload);
+    }
+
+    if (_config.cancelToken || _config.signal) {
+      // Handle cancellation
+      // eslint-disable-next-line func-names
+      onCanceled = cancel => {
+        if (!request) {
+          return;
+        }
+        reject(!cancel || cancel.type ? new CanceledError(null, config, request) : cancel);
+        request.abort();
+        request = null;
+      };
+
+      _config.cancelToken && _config.cancelToken.subscribe(onCanceled);
+      if (_config.signal) {
+        _config.signal.aborted ? onCanceled() : _config.signal.addEventListener('abort', onCanceled);
+      }
+    }
+
+    const protocol = parseProtocol(_config.url);
+
+    if (protocol && platform.protocols.indexOf(protocol) === -1) {
+      reject(new AxiosError('Unsupported protocol ' + protocol + ':', AxiosError.ERR_BAD_REQUEST, config));
+      return;
+    }
+
+
+    // Send the request
+    request.send(requestData || null);
+  });
+}