Fix http params encode

Author: bboure

src/data-loaders/HttpDataLoader.js

@@ -1,4 +1,33 @@
 import axios from 'axios';
+import { isObject, forEach } from 'lodash';
+
+const paramsSerializer = (params) => {
+  const parts = [];
+
+  forEach(params, (value, key) => {
+    if (value === null || typeof value === 'undefined') {
+      return;
+    }
+
+    let k = key;
+    let v = value;
+    if (Array.isArray(v)) {
+      k += '[]';
+    } else {
+      v = [v];
+    }
+
+    forEach(v, (val) => {
+      let finalValue = val;
+      if (isObject(finalValue)) {
+        finalValue = JSON.stringify(finalValue);
+      }
+      parts.push(`${k}=${finalValue}`);
+    });
+  });
+
+  return parts.join('&');
+};
 
 export default class HttpDataLoader {
   constructor(config) {
@@ -13,6 +42,7 @@ export default class HttpDataLoader {
         url: req.resourcePath,
         headers: req.params.headers,
         params: req.params.query,
+        paramsSerializer,
         method: req.method.toLowerCase(),
         data: req.params.body,
       });