Client header parsing fails on empty header
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mliarakos commented
The ClientServiceCallInvoker.parseHeaders method fails if there are no response headers or if a header is empty. The method assumes headers will have the form "key: values".
The method uses xhr.getAllResponseHeaders() to get headers. In some cases a request will fail with no response headers (e.g., CORS issue), which causes getAllResponseHeaders() to return an empty string and the method to fail. Additionally, if a header was ever empty it would also cause the method to fail.