Hey, seems u have a problem with CORS
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS cheers -----Ursprüngliche Nachricht----- Von: Zahi Fail [mailto:zahi.f...@gmail.com] Gesendet: Mittwoch, 25. April 2018 12:53 An: Tomcat Users List <users@tomcat.apache.org> Betreff: [eX-Bulk]: Error while sending ajax post request to my tomcat web app Hello, I'm working with Tomcat 9.0.6 version as my servlet, I have tested my web service with postman and it seems to work fine. While i tried to send simple ajax that i have build and tested in chrome, i got an error. *the request is :* function setAllTlcsStatus() { var tlc = [{"id":1, "code":2, "time":"2009-02-15", "cycleSecond":22, "programNumber":1221, "stageNumber":22, "moves":"22", "detectors":"fead","conditions":"2ddsa"}; data.push(tlc); $.ajax({ type: 'POST', url: "http://127.0.0.1:8080/userManagement/rest/Traffic/users2";, dataType: 'json', contentType: 'application/json', data: JSON.stringify(tlc), success: function( data, textStatus, jQxhr ){ alert("good"); }, error: function( jqXhr, textStatus, errorThrown ){ alert("Not good"); console.log( errorThrown ); } }); } *and the error i got: * *Failed to load http://127.0.0.1:8080/userManagement/rest/Traffic/users2 <http://127.0.0.1:8080/userManagement/rest/Traffic/users2>: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.*
