Fixing baseURL not working in interceptors (#950)

* Fixing baseURL not working in interceptors

* add test for  modify base URL in request interceptor

lib/core/Axios.js

@@ -4,8 +4,6 @@ var defaults = require('./../defaults');
 var utils = require('./../utils');
 var InterceptorManager = require('./InterceptorManager');
 var dispatchRequest = require('./dispatchRequest');
-var isAbsoluteURL = require('./../helpers/isAbsoluteURL');
-var combineURLs = require('./../helpers/combineURLs');
 
 /**
  * Create a new instance of Axios
@@ -37,11 +35,6 @@ Axios.prototype.request = function request(config) {
   config = utils.merge(defaults, this.defaults, { method: 'get' }, config);
   config.method = config.method.toLowerCase();
 
-  // Support baseURL config
-  if (config.baseURL && !isAbsoluteURL(config.url)) {
-    config.url = combineURLs(config.baseURL, config.url);
-  }
-
   // Hook up interceptors middleware
   var chain = [dispatchRequest, undefined];
   var promise = Promise.resolve(config);

lib/core/dispatchRequest.js

@@ -4,6 +4,8 @@ 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.
@@ -23,6 +25,11 @@ 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 || {};