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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I have a front-end and one back-end application. For the front-end I entered the web origin: <a href="http://localhost:4000">http://localhost:4000</a>. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Additionally I added a line <enable-cors>true</enable-cors> to the standalone.xml (wildfly 10 / keycloak 1.9.4.Final)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The browser console displays:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:4000, http://localhost:4000', but only one is allowed. Origin 'http://localhost:4000' is therefore not allowed access.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>If I remove the line from the client I get:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>localhost/:1 XMLHttpRequest cannot load http://localhost:8080/auth/realms/... /protocol/openid-connect/token. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4000' is therefore not allowed access.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Has anyone a hint what could cause this?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Thx a lot<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Kevin<o:p></o:p></span></p></div></body></html>