# 4472 Cross-Origin OPTIONS Requests Not Being Handled Properly by Web Server

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For performance reasons I tried to run an EWB application from a linux webspace. The data are served from a Windows host with an EWB server.

The MainForm of the app loads, then nothing seems to happen.

Debugging the app with Chrome shows, that the data-requests work, but are very slow (querying a small table needs about 20 seconds).Executing the same request by typing the url manually in the browser, results in a very quick response (<10 ms).