fix(formdata): add hotfix to use the asynchronous API to compute the content-length header value;

lib/adapters/http.js

@@ -7,6 +7,7 @@ import buildURL from './../helpers/buildURL.js';
 import {getProxyForUrl} from 'proxy-from-env';
 import http from 'http';
 import https from 'https';
+import util from 'util';
 import followRedirects from 'follow-redirects';
 import zlib from 'zlib';
 import {VERSION} from '../env/data.js';
@@ -117,7 +118,8 @@ const isHttpAdapterSupported = typeof process !== 'undefined' && utils.kindOf(pr
 
 /*eslint consistent-return:0*/
 export default isHttpAdapterSupported && function httpAdapter(config) {
-  return new Promise(function dispatchHttpRequest(resolvePromise, rejectPromise) {
+  /*eslint no-async-promise-executor:0*/
+  return new Promise(async function dispatchHttpRequest(resolvePromise, rejectPromise) {
     let data = config.data;
     const responseType = config.responseType;
     const responseEncoding = config.responseEncoding;
@@ -208,7 +210,7 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
         convertedData = convertedData.toString(responseEncoding);
 
         if (!responseEncoding || responseEncoding === 'utf8') {
-          data = utils.stripBOM(convertedData);
+          convertedData = utils.stripBOM(convertedData);
         }
       } else if (responseType === 'stream') {
         convertedData = stream.Readable.from(convertedData);
@@ -258,9 +260,14 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
       // support for https://www.npmjs.com/package/form-data api
     } else if (utils.isFormData(data) && utils.isFunction(data.getHeaders)) {
       headers.set(data.getHeaders());
-      if (utils.isFunction(data.getLengthSync)) { // check if the undocumented API exists
-        const knownLength = data.getLengthSync();
-        !utils.isUndefined(knownLength) && headers.setContentLength(knownLength, false);
+
+      if (!headers.hasContentLength()) {
+        try {
+          const knownLength = await util.promisify(data.getLength).call(data);
+          headers.setContentLength(knownLength);
+          /*eslint no-empty:0*/
+        } catch (e) {
+        }
       }
     } else if (utils.isBlob(data)) {
       data.size && headers.setContentType(data.type || 'application/octet-stream');

lib/core/AxiosHeaders.js

@@ -141,7 +141,7 @@ class AxiosHeaders {
     if (header) {
       const key = utils.findKey(this, header);
 
-      return !!(key && (!matcher || matchHeaderValue(this, this[key], key, matcher)));
+      return !!(key && this[key] !== undefined && (!matcher || matchHeaderValue(this, this[key], key, matcher)));
     }
 
     return false;

package.json

@@ -204,4 +204,4 @@
       "@commitlint/config-conventional"
     ]
   }
-}
+}

test/unit/adapters/http.js

@@ -1576,6 +1576,10 @@ describe('supports http with nodejs', function () {
       it('should allow passing FormData', function (done) {
         var form = new FormDataLegacy();
         var file1 = Buffer.from('foo', 'utf8');
+        const image = path.resolve(__dirname, './axios.png');
+        const fileStream = fs.createReadStream(image);
+
+        const stat = fs.statSync(image);
 
         form.append('foo', "bar");
         form.append('file1', file1, {
@@ -1584,9 +1588,13 @@ describe('supports http with nodejs', function () {
           contentType: 'image/jpeg'
         });
 
+        form.append('fileStream', fileStream);
+
         server = http.createServer(function (req, res) {
           var receivedForm = new formidable.IncomingForm();
 
+          assert.ok(req.rawHeaders.find(header => header.toLowerCase() === 'content-length'));
+
           receivedForm.parse(req, function (err, fields, files) {
             if (err) {
               return done(err);
@@ -1609,6 +1617,10 @@ describe('supports http with nodejs', function () {
             assert.strictEqual(res.data.files.file1.originalFilename, 'temp/bar.jpg');
             assert.strictEqual(res.data.files.file1.size, 3);
 
+            assert.strictEqual(res.data.files.fileStream.mimetype, 'image/png');
+            assert.strictEqual(res.data.files.fileStream.originalFilename, 'axios.png');
+            assert.strictEqual(res.data.files.fileStream.size, stat.size);
+
             done();
           }).catch(done);
         });