XHR sends string 'undefined' as request body in IE11

[bhamme]

If the request given to the XHR client doesn't include an entity prop, xhr.js sends undefined to XMLHttpRequest.send which seems to change the content header if run in IE11. It seems like other libraries get around this by just checking for undefined and passing null instead: https://github.com/axios/axios/issues/248 https://github.com/aurelia/http-client/issues/41

Think xhr.js just needs to be modified to perform that check as well

entity = request.entity || null;
...
client.send(entity);

In the meantime the workaround is just to explicitly pass in a null entity in the request.

[scothis]

rest.js is no longer maintained