The current csrftoken parser breaks on multiple crsftokens

For example: 

`Cookie: csrftoken=asdfasd; sessionid=asdfasdf; csrftoken=qwertyqwerty`

This can happen when multiple sessions, or multiple csrftokens for different paths.

graphene_django/static/graphene_django/graphiql.js

@@ -1,26 +1,33 @@
 (function() {
-
   // Parse the cookie value for a CSRF token
   var csrftoken;
-  var cookies = ('; ' + document.cookie).split('; csrftoken=');
-  if (cookies.length == 2)
-    csrftoken = cookies.pop().split(';').shift();
-
+  var cookies = document.cookie.split(';').reduce((p, c) => {
+    let x = {};
+    let key = c.split('=')[0].trim();
+    x[key] = p[key] ? p[key].concat([c.split('=')[1]]) : [c.split('=')[1]];
+    return Object.assign(p, x);
+  }, {});
   // Collect the URL parameters
   var parameters = {};
-  window.location.hash.substr(1).split('&').forEach(function (entry) {
-    var eq = entry.indexOf('=');
-    if (eq >= 0) {
-      parameters[decodeURIComponent(entry.slice(0, eq))] =
-        decodeURIComponent(entry.slice(eq + 1));
-    }
-  });
+  window.location.hash
+    .substr(1)
+    .split('&')
+    .forEach(function(entry) {
+      var eq = entry.indexOf('=');
+      if (eq >= 0) {
+        parameters[decodeURIComponent(entry.slice(0, eq))] = decodeURIComponent(entry.slice(eq + 1));
+      }
+    });
   // Produce a Location fragment string from a parameter object.
   function locationQuery(params) {
-    return '#' + Object.keys(params).map(function (key) {
-      return encodeURIComponent(key) + '=' +
-        encodeURIComponent(params[key]);
-    }).join('&');
+    return (
+      '#' +
+      Object.keys(params)
+        .map(function(key) {
+          return encodeURIComponent(key) + '=' + encodeURIComponent(params[key]);
+        })
+        .join('&')
+    );
   }
   // Derive a fetch URL from the current URL, sans the GraphQL parameters.
   var graphqlParamNames = {
@@ -40,26 +47,43 @@
   // Defines a GraphQL fetcher using the fetch API.
   function graphQLFetcher(graphQLParams) {
     var headers = {
-      'Accept': 'application/json',
+      Accept: 'application/json',
       'Content-Type': 'application/json'
     };
-    if (csrftoken) {
-      headers['X-CSRFToken'] = csrftoken;
+
+    var cookies = document.cookie.split(';').reduce((p, c) => {
+      let x = {};
+      let key = c.split('=')[0].trim();
+      x[key] = p[key] ? p[key].concat([c.split('=')[1]]) : [c.split('=')[1]];
+      return Object.assign(p, x);
+    }, {});
+    if (cookies.csrftoken && cookies.csrftoken.length) {
+      headers['X-CSRFToken'] = cookies.csrftoken.pop();
     }
-    return fetch(fetchURL, {
-      method: 'post',
-      headers: headers,
-      body: JSON.stringify(graphQLParams),
-      credentials: 'include',
-    }).then(function (response) {
-      return response.text();
-    }).then(function (responseBody) {
-      try {
-        return JSON.parse(responseBody);
-      } catch (error) {
-        return responseBody;
-      }
-    });
+    function getFetch(headers) {
+      return fetch(fetchURL, {
+        method: 'post',
+        headers: headers,
+        body: JSON.stringify(graphQLParams),
+        credentials: 'include'
+      });
+    }
+    return getFetch(headers)
+      .then(function(response) {
+        console.log(headers);
+        return response.text();
+      })
+      .then(function(responseBody) {
+        try {
+          return JSON.parse(responseBody);
+        } catch (error) {
+          if (cookies.csrftoken.length) {
+            headers['X-CSRFToken'] = cookies.csrftoken.pop();
+            return getFetch(headers);
+          }
+          return responseBody;
+        }
+      });
   }
   // When the query and variables string is edited, update the URL bar so
   // that it can be easily shared.
@@ -80,11 +104,11 @@
   }
   var options = {
     fetcher: graphQLFetcher,
-      onEditQuery: onEditQuery,
-      onEditVariables: onEditVariables,
-      onEditOperationName: onEditOperationName,
-      query: parameters.query,
-  }
+    onEditQuery: onEditQuery,
+    onEditVariables: onEditVariables,
+    onEditOperationName: onEditOperationName,
+    query: parameters.query
+  };
   if (parameters.variables) {
     options.variables = parameters.variables;
   }
@@ -92,8 +116,5 @@
     options.operationName = parameters.operation_name;
   }
   // Render <GraphiQL /> into the body.
-  ReactDOM.render(
-    React.createElement(GraphiQL, options),
-    document.body
-  );
+  ReactDOM.render(React.createElement(GraphiQL, options), document.body);
 })();