[#545] Fixes => content-length request header is removed when parse…

…ReqBody is false.

README.md

@@ -592,6 +592,7 @@ app.use('/', proxy('internalhost.example.com', {
 
 | Release | Notes |
 | --- | --- |
+| next | Fixes => content-length request header is removed when parseReqBody is false (#549) |
 | 2.1.1 | (trivial) Fixes formatting in README.|
 | 2.1.0 | Fixes parsing error in content-types. Improves behavior of proxyReqBodyDecorator when parseReqBody=false. Repairs issue where authors can't use proxy() twice in Express middleware stack.  Fix `new Buffer` deprecation warning. |
 | 2.0.0 | Update all dependencies; set stage for next iteration. `express-http-proxy` interface has not changed, but the underlying libraries are not guaranteed to be backward compatible. Versions beyond this point are expected to be run in node verions >= 16. |

lib/requestOptions.js

@@ -54,7 +54,7 @@ function reqHeaders(req, options) {
 
   var headers = options.headers || {};
 
-  var skipHdrs = [ 'connection', 'content-length' ];
+  var skipHdrs = [ 'connection' ];
   if (!options.preserveHostHdr) {
     skipHdrs.push('host');
   }

test/setsContentLength.js

@@ -0,0 +1,84 @@
+'use strict';
+var assert = require('assert');
+var express = require('express');
+var request = require('supertest');
+var fs = require('fs');
+var os = require('os');
+var proxy = require('../');
+var startProxyTarget = require('./support/proxyTarget');
+
+describe('headers: [content-length]', function () {
+  var server;
+
+  before(function () {
+    server = startProxyTarget(8109, 1000);
+  });
+
+  after(function () {
+    server.close();
+  });
+
+  this.timeout(10000);
+
+  describe('on proxy request', function () {
+    it('a `GET` request should have a content-length header, and it should be 0', function (done) {
+      var app = express();
+      app.use(proxy('localhost:8109'));
+      request(app)
+        .get('/headers')
+        .end(function (err, res) {
+          if (err) { throw err; }
+          assert(res.body.headers['content-length']);
+          const contentLength = res.body.headers['content-length'];
+          assert(Number(contentLength) === 0);
+          done(err);
+        });
+    });
+
+    describe('a `POST` request should have a content-length header, and it should be accurate', function () {
+      it('when the author does not modify the proxyRequest', function(done) {
+        var app = express();
+        app.use(proxy('localhost:8109'));
+
+        request(app)
+          .post('/headers')
+          .send({
+            data: 'random string of words'
+          })
+          .set('Content-Type', 'application/json')
+          .set('Accept', 'application/json')
+          .end(function (err, res) {
+            if (err) { throw err; }
+            assert(res.body.headers['content-length']);
+            const contentLength = res.body.headers['content-length'];
+            assert.equal(contentLength, 33);
+            done(err);
+          });
+      });
+
+      it('when using parseReqBody as false', function (done) {
+        var app = express();
+        app.use(proxy('localhost:8109', {
+          parseReqBody: false
+        }));
+
+        request(app)
+          .post('/headers')
+          .send({
+            data: 'random string of words'
+          })
+          .set('Content-Type', 'application/json')
+          .set('Accept', 'application/json')
+          .end(function (err, res) {
+            if (err) { throw err; }
+            assert(res.body.headers['content-length']);
+            const contentLength = res.body.headers['content-length'];
+            assert.equal(contentLength, 33);
+            done(err);
+          });
+      });
+    });
+  });
+
+
+});