#### Describe the bug
Intermittent hangs with requests that I've debugged down to end not being called on the stream.

#### To Reproduce
Code snippet to reproduce, ideally that will work by pasting into something like https://npm.runkit.com/axios, a hosted solution, or a repository that illustrates the issue. **If your problem is not reproducible, please file under Support or Usage Question**

Excerpts from my code showing the Axios call
```js
const SocksProxyAgent = require('socks-proxy-agent')
const proxyOptions = `socks5://127.0.0.1:9050`
const httpsAgent = new SocksProxyAgent(proxyOptions)
const client = axios.create({ httpsAgent })
...
try {
      response = await client.get(url)  <---- the call of no return
    } catch (err) {
      outcodeLogger.error(err) <---- it never gets here
      throw new Error(`HTTP error ${err} for outcode ${outcodeNumber} `)
    } finally {
      outcodeLogger.trace('13')  <---- it never gets here
    }
 <---- it never gets here
```
Axios http.js with debug messages added
```js
'use strict';

var utils = require('./../utils');
var settle = require('./../core/settle');
var buildFullPath = require('../core/buildFullPath');
var buildURL = require('./../helpers/buildURL');
var http = require('http');
var https = require('https');
var httpFollow = require('follow-redirects').http;
var httpsFollow = require('follow-redirects').https;
var url = require('url');
var zlib = require('zlib');
var pkg = require('./../../package.json');
var createError = require('../core/createError');
var enhanceError = require('../core/enhanceError');

var isHttps = /https:?/;

/**
 *
 * @param {http.ClientRequestArgs} options
 * @param {AxiosProxyConfig} proxy
 * @param {string} location
 */
function setProxy(options, proxy, location) {
  options.hostname = proxy.host;
  options.host = proxy.host;
  options.port = proxy.port;
  options.path = location;

  // Basic proxy authorization
  if (proxy.auth) {
    var base64 = Buffer.from(proxy.auth.username + ':' + proxy.auth.password, 'utf8').toString('base64');
    options.headers['Proxy-Authorization'] = 'Basic ' + base64;
  }

  // If a proxy is used, any redirects must also pass through the proxy
  options.beforeRedirect = function beforeRedirect(redirection) {
    redirection.headers.host = redirection.host;
    setProxy(redirection, proxy, redirection.href);
  };
}

/*eslint consistent-return:0*/
module.exports = function httpAdapter(config) {
  const {url:u}=config
  console.log(`${u} start httpAdapter`)
  return new Promise(function dispatchHttpRequest(resolvePromise, rejectPromise) {
    var resolve = function resolve(value) {
      resolvePromise(value);
    };
    var reject = function reject(value) {
      rejectPromise(value);
    };
    var data = config.data;
    var headers = config.headers;

    // Set User-Agent (required by some servers)
    // Only set header if it hasn't been set in config
    // See https://github.com/axios/axios/issues/69
    if (!headers['User-Agent'] && !headers['user-agent']) {
      headers['User-Agent'] = 'axios/' + pkg.version;
    }

    console.log(`${u} buffer stuff`)
    if (data && !utils.isStream(data)) {
      if (Buffer.isBuffer(data)) {
        // Nothing to do...
      } else if (utils.isArrayBuffer(data)) {
        data = Buffer.from(new Uint8Array(data));
      } else if (utils.isString(data)) {
        data = Buffer.from(data, 'utf-8');
      } else {
        return reject(createError(
          'Data after transformation must be a string, an ArrayBuffer, a Buffer, or a Stream',
          config
        ));
      }

      // Add Content-Length header if data exists
      headers['Content-Length'] = data.length;
    }

    // HTTP basic authentication
    console.log(`${u} start auth`)

    var auth = undefined;
    if (config.auth) {
      var username = config.auth.username || '';
      var password = config.auth.password || '';
      auth = username + ':' + password;
    }

    // Parse url
    console.log(`${u} start parse url`)

    var fullPath = buildFullPath(config.baseURL, config.url);
    var parsed = url.parse(fullPath);
    var protocol = parsed.protocol || 'http:';

    if (!auth && parsed.auth) {
      var urlAuth = parsed.auth.split(':');
      var urlUsername = urlAuth[0] || '';
      var urlPassword = urlAuth[1] || '';
      auth = urlUsername + ':' + urlPassword;
    }

    if (auth) {
      delete headers.Authorization;
    }

    var isHttpsRequest = isHttps.test(protocol);
    var agent = isHttpsRequest ? config.httpsAgent : config.httpAgent;

    console.log(`${u} build url`)

    var options = {
      path: buildURL(parsed.path, config.params, config.paramsSerializer).replace(/^\?/, ''),
      method: config.method.toUpperCase(),
      headers: headers,
      agent: agent,
      agents: { http: config.httpAgent, https: config.httpsAgent },
      auth: auth
    };

    if (config.socketPath) {
      options.socketPath = config.socketPath;
    } else {
      options.hostname = parsed.hostname;
      options.port = parsed.port;
    }

    console.log(`${u} start proxy`)

    var proxy = config.proxy;
    if (!proxy && proxy !== false) {
      var proxyEnv = protocol.slice(0, -1) + '_proxy';
      var proxyUrl = process.env[proxyEnv] || process.env[proxyEnv.toUpperCase()];
      if (proxyUrl) {
        var parsedProxyUrl = url.parse(proxyUrl);
        var noProxyEnv = process.env.no_proxy || process.env.NO_PROXY;
        var shouldProxy = true;

        if (noProxyEnv) {
          var noProxy = noProxyEnv.split(',').map(function trim(s) {
            return s.trim();
          });

          shouldProxy = !noProxy.some(function proxyMatch(proxyElement) {
            if (!proxyElement) {
              return false;
            }
            if (proxyElement === '*') {
              return true;
            }
            if (proxyElement[0] === '.' &&
                parsed.hostname.substr(parsed.hostname.length - proxyElement.length) === proxyElement) {
              return true;
            }

            return parsed.hostname === proxyElement;
          });
        }

        if (shouldProxy) {
          proxy = {
            host: parsedProxyUrl.hostname,
            port: parsedProxyUrl.port,
            protocol: parsedProxyUrl.protocol
          };

          if (parsedProxyUrl.auth) {
            var proxyUrlAuth = parsedProxyUrl.auth.split(':');
            proxy.auth = {
              username: proxyUrlAuth[0],
              password: proxyUrlAuth[1]
            };
          }
        }
      }
    }

    console.log(`${u} start proxy 2`)

    if (proxy) {
      options.headers.host = parsed.hostname + (parsed.port ? ':' + parsed.port : '');
      setProxy(options, proxy, protocol + '//' + parsed.hostname + (parsed.port ? ':' + parsed.port : '') + options.path);
    }

    console.log(`${u} start transport`)

    var transport;
    var isHttpsProxy = isHttpsRequest && (proxy ? isHttps.test(proxy.protocol) : true);
    if (config.transport) {
      transport = config.transport;
    } else if (config.maxRedirects === 0) {
      transport = isHttpsProxy ? https : http;
    } else {
      if (config.maxRedirects) {
        options.maxRedirects = config.maxRedirects;
      }
      transport = isHttpsProxy ? httpsFollow : httpFollow;
    }

    if (config.maxBodyLength > -1) {
      options.maxBodyLength = config.maxBodyLength;
    }

    console.log(`${u} start create request`)

    // Create the request
    var req = transport.request(options, function handleResponse(res) {
      if (req.aborted) return;

      // uncompress the response body transparently if required
      var stream = res;

      // return the last request in case of redirects
      var lastRequest = res.req || req;


      // if no content, is HEAD request or decompress disabled we should not decompress
      if (res.statusCode !== 204 && lastRequest.method !== 'HEAD' && config.decompress !== false) {
        switch (res.headers['content-encoding']) {
        /*eslint default-case:0*/
        case 'gzip':
        case 'compress':
        case 'deflate':
        // add the unzipper to the body stream processing pipeline
          stream = stream.pipe(zlib.createUnzip());

          // remove the content-encoding in order to not confuse downstream operations
          delete res.headers['content-encoding'];
          break;
        }
      }

      var response = {
        status: res.statusCode,
        statusText: res.statusMessage,
        headers: res.headers,
        config: config,
        request: lastRequest
      };

      if (config.responseType === 'stream') {
        response.data = stream;
        settle(resolve, reject, response);
      } else {
        var responseBuffer = [];
        stream.on('data', function handleStreamData(chunk) {
          console.log(`${u} stream.on start`)

          responseBuffer.push(chunk);
          console.log(`${u} stream.on pushed ${config.maxContentLength} ${Buffer.concat(responseBuffer).length}`)

          // make sure the content length is not over the maxContentLength if specified
          if (config.maxContentLength > -1 && Buffer.concat(responseBuffer).length > config.maxContentLength) {
            stream.destroy();
            console.log(`${u} destroy`)
            reject(createError('maxContentLength size of ' + config.maxContentLength + ' exceeded',
              config, null, lastRequest));
              console.log(`${u} rejected`)
            }
            console.log(`${u} end`)

        });

        stream.on('error', function handleStreamError(err) {
          console.log(`${u} stream.on error`)

          if (req.aborted) return;
          reject(enhanceError(err, config, null, lastRequest));
        });

        stream.on('end', function handleStreamEnd() {
          console.log(`${u} stream.on end`)

          var responseData = Buffer.concat(responseBuffer);
          if (config.responseType !== 'arraybuffer') {
            responseData = responseData.toString(config.responseEncoding);
            if (!config.responseEncoding || config.responseEncoding === 'utf8') {
              responseData = utils.stripBOM(responseData);
            }
          }

          response.data = responseData;
          settle(resolve, reject, response);
        });
      }
    });

    console.log(`${u} start handle errors`)

    // Handle errors
    req.on('error', function handleRequestError(err) {
      console.log(`${u} ${err.code}`)
      console.log(`${u} ${req.aborted}`)
      if (req.aborted && err.code !== 'ERR_FR_TOO_MANY_REDIRECTS') return;
      reject(enhanceError(err, config, null, req));
    });

    console.log(`${u} start timeout to ${config.timeout}`)

    // Handle request timeout
    if (config.timeout) {

      // Sometime, the response will be very slow, and does not respond, the connect event will be block by event loop system.
      // And timer callback will be fired, and abort() will be invoked before connection, then get "socket hang up" and code ECONNRESET.
      // At this time, if we have a large number of request, nodejs will hang up some socket on background. and the number will up and up.
      // And then these socket which be hang up will devoring CPU little by little.
      // ClientRequest.setTimeout will be fired on the specify milliseconds, and can make sure that abort() will be fired after connect.
      req.setTimeout(config.timeout, function handleRequestTimeout() {
        console.log(`${u} timeout1`)
        req.abort();
        console.log(`${u} timeout2`)
        reject(createError('timeout of ' + config.timeout + 'ms exceeded', config, 'ECONNABORTED', req));
        console.log(`${u} timeout3`)
      });
    }
    console.log(`${u} timeout4`)

    if (config.cancelToken) {
      console.log(`${u} timeout5`)
      // Handle cancellation
      config.cancelToken.promise.then(function onCanceled(cancel) {
        if (req.aborted) return;

        req.abort();
        reject(cancel);
      });
    }
    console.log(`${u} timeout6`)

    // Send the request
    if (utils.isStream(data)) {
      data.on('error', function handleStreamError(err) {
        console.log(`${u} data.on error`)
        reject(enhanceError(err, config, null, req));
      }).pipe(req);
    } else {
      console.log(`${u} 888`)
      req.end(data);
    }
    console.log(`${u} 999`)
  });
};
```

```
<URL> start proxy
<URL> start proxy 2
<URL> start transport
<URL> start create request
<URL> start handle errors
<URL> start timeout to 0
<URL> timeout4
<URL> timeout6
<URL> 888
<URL> 999
<URL> stream.on start
<URL> stream.on pushed -1 812
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 2260
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 3708
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 5156
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 6604
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 8052
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 8184
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 9492
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 10940
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 12388
<URL> end
<URL> stream.on start
<URL> stream.on pushed -1 13836
<URL> end

No call to stream.end so the promise is never resolved/rejected
```


#### Expected behavior
It doesn't hang or it times out

#### Environment
 - Axios Version 0.21.1
 - Adapter HTTP
 - Browser n/a
 - Browser Version n/a
 - Node.js Version 14.16
 - OS: Ubuntu 20.04
 - Additional Library Versions : using socks-proxy-agent": "^5.0.0",


#### Additional context/Screenshots
Add any other context about the problem here. If applicable, add screenshots to help explain.

test/unit/adapters/http.js
timeout: { strangeTimeout: 250 }
      }).then(function (res) {
        success = true;
      }).catch(function (err) {
        error = err;
        failure = true;
      });
      setTimeout(function () {
        assert.equal(success, false, 'request should not succeed');
        assert.equal(failure, true, 'request should fail');
        assert.equal(error.code, 'ERR_PARSE_TIMEOUT');
        assert.equal(error.message, 'error trying to parse `config.timeout` to int');
        done();
      }, 300);
    });
  });
  it('should parse the timeout property', function (done) {
    server = http.createServer(function (req, res) {
      setTimeout(function () {
        res.end();
      }, 1000);
    }).listen(4444, function () {
      var success = false, failure = false;
      var error;
      axios.get('http://localhost:4444/', {
        timeout: '250'
      }).then(function (res) {
        success = true;
      }).catch(function (err) {
        error = err;