Do not modify config.url when using a relative baseURL (resolves axio…

…s#1628) (axios#2391)

* Adding tests to show config.url mutation

Because config.url is modified while processing the request
when the baseURL is set,
it is impossible to perform a retry with the provided config object.

Ref axios#1628

* Fixing url combining without modifying config.url

As config.url is not modified anymore during the request processing.
The request can safely be retried after it failed with the provided
config.

resolves axios#1628

lib/adapters/http.js

@@ -2,6 +2,7 @@
 
 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');
@@ -64,7 +65,8 @@ module.exports = function httpAdapter(config) {
     }
 
     // Parse url
-    var parsed = url.parse(config.url);
+    var fullPath = buildFullPath(config.baseURL, config.url);
+    var parsed = url.parse(fullPath);
     var protocol = parsed.protocol || 'http:';
 
     if (!auth && parsed.auth) {

lib/adapters/xhr.js

@@ -3,6 +3,7 @@
 var utils = require('./../utils');
 var settle = require('./../core/settle');
 var buildURL = require('./../helpers/buildURL');
+var buildFullPath = require('../core/buildFullPath');
 var parseHeaders = require('./../helpers/parseHeaders');
 var isURLSameOrigin = require('./../helpers/isURLSameOrigin');
 var createError = require('../core/createError');
@@ -25,7 +26,8 @@ module.exports = function xhrAdapter(config) {
       requestHeaders.Authorization = 'Basic ' + btoa(username + ':' + password);
     }
 
-    request.open(config.method.toUpperCase(), buildURL(config.url, config.params, config.paramsSerializer), true);
+    var fullPath = buildFullPath(config.baseURL, config.url);
+    request.open(config.method.toUpperCase(), buildURL(fullPath, config.params, config.paramsSerializer), true);
 
     // Set the request timeout in MS
     request.timeout = config.timeout;
@@ -100,7 +102,7 @@ module.exports = function xhrAdapter(config) {
       var cookies = require('./../helpers/cookies');
 
       // Add xsrf header
-      var xsrfValue = (config.withCredentials || isURLSameOrigin(config.url)) && config.xsrfCookieName ?
+      var xsrfValue = (config.withCredentials || isURLSameOrigin(fullPath)) && config.xsrfCookieName ?
         cookies.read(config.xsrfCookieName) :
         undefined;
 

lib/core/buildFullPath.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var isAbsoluteURL = require('../helpers/isAbsoluteURL');
+var combineURLs = require('../helpers/combineURLs');
+
+/**
+ * Creates a new URL by combining the baseURL with the requestedURL,
+ * only when the requestedURL is not already an absolute URL.
+ * If the requestURL is absolute, this function returns the requestedURL untouched.
+ *
+ * @param {string} baseURL The base URL
+ * @param {string} requestedURL Absolute or relative URL to combine
+ * @returns {string} The combined full path
+ */
+module.exports = function buildFullPath(baseURL, requestedURL) {
+  if (baseURL && !isAbsoluteURL(requestedURL)) {
+    return combineURLs(baseURL, requestedURL);
+  }
+  return requestedURL;
+};

lib/core/dispatchRequest.js

@@ -4,8 +4,6 @@ var utils = require('./../utils');
 var transformData = require('./transformData');
 var isCancel = require('../cancel/isCancel');
 var defaults = require('../defaults');
-var isAbsoluteURL = require('./../helpers/isAbsoluteURL');
-var combineURLs = require('./../helpers/combineURLs');
 
 /**
  * Throws a `Cancel` if cancellation has been requested.
@@ -25,11 +23,6 @@ function throwIfCancellationRequested(config) {
 module.exports = function dispatchRequest(config) {
   throwIfCancellationRequested(config);
 
-  // Support baseURL config
-  if (config.baseURL && !isAbsoluteURL(config.url)) {
-    config.url = combineURLs(config.baseURL, config.url);
-  }
-
   // Ensure headers exist
   config.headers = config.headers || {};
 

test/specs/core/buildFullPath.spec.js

@@ -0,0 +1,20 @@
+var buildFullPath = require('../../../lib/core/buildFullPath');
+
+describe('helpers::buildFullPath', function () {
+  it('should combine URLs when the requestedURL is relative', function () {
+    expect(buildFullPath('https://api.github.com', '/users')).toBe('https://api.github.com/users');
+  });
+
+  it('should return the requestedURL when it is absolute', function () {
+    expect(buildFullPath('https://api.github.com', 'https://api.example.com/users')).toBe('https://api.example.com/users');
+  });
+
+  it('should not combine URLs when the baseURL is not configured', function () {
+    expect(buildFullPath(undefined, '/users')).toBe('/users');
+  });
+
+  it('should combine URLs when the baseURL and requestedURL are relative', function () {
+    expect(buildFullPath('/api', '/users')).toBe('/api/users');
+  });
+
+});

test/specs/requests.spec.js

@@ -245,6 +245,30 @@ describe('requests', function () {
     });
   });
 
+  it('should not modify the config url with relative baseURL', function (done) {
+    var config;
+
+    axios.get('/foo', {
+        baseURL: '/api'
+    }).catch(function (error) {
+        config = error.config;
+    });
+
+    getAjaxRequest().then(function (request) {
+      request.respondWith({
+        status: 404,
+        statusText: 'NOT FOUND',
+        responseText: 'Resource not found'
+      });
+
+      setTimeout(function () {
+        expect(config.baseURL).toEqual('/api');
+        expect(config.url).toEqual('/foo');
+        done();
+      }, 100);
+    });
+  });
+
   it('should allow overriding Content-Type header case-insensitive', function (done) {
     var response;
     var contentType = 'application/vnd.myapp.type+json';

test/unit/adapters/http.js

@@ -646,6 +646,20 @@ describe('supports http with nodejs', function () {
       });
     });
   });
+
+  it('should combine baseURL and url', function (done) {
+    server = http.createServer(function (req, res) {
+      res.end();
+    }).listen(4444, function () {
+      axios.get('/foo', {
+        baseURL: 'http://localhost:4444/',
+      }).then(function (res) {
+        assert.equal(res.config.baseURL, 'http://localhost:4444/');
+        assert.equal(res.config.url, '/foo');
+        done();
+      });
+    });
+  });
 });