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Fix for "Umbraco PostSave 400 Bad Request"

Custom error config changes might cause some Umbraco 400 response issues. As a results while saving and publishing umbraco content, you might see "PostSave 400 Bad Request" messages. In my case I also couldn't see some umbraco mandatory field validation messages.

In order to fix it you can add the following line to your web.config and it should start working.
  <location path="umbraco">
    <system.webServer>
      <httpErrors existingResponse="PassThrough" />
    </system.webServer>
  </location>
  1. Request URL:
    https://DOMAINNAME/umbraco/backoffice/UmbracoApi/Content/PostSave
  2. Request Method:
    POST
  3. Status Code:
    400 Bad Request

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