jQuery ajax call to REST service

Question

I m trying to make an ajax call from jquery to a rest service  The rest service used is right from a tutorial of mkyong s blog  this one  http   www mkyong com webservices jax-rs integrate-jackson-with-resteasy   The service works  but when i try to make a call from jQuery  in Firebug there is a 200 status code  but in the response section  nothing   Here is the html page with the ajax call    lt html gt   lt head gt       lt script type  text javascript  src  jquery-1 6 2 min js  gt  lt  script gt   lt  head gt    lt body gt      lt button id  ajax  gt ajax call lt  button gt   lt button id  json  gt json lt  button gt    lt script type  text javascript  gt          json   click function             alert  json               getJSON  http   localhost 8080 restws json product get            function data                alert data                                              ajax   click function             alert  ajax               ajax                 type   GET                dataType   json                url   http   localhost 8080 restws json product get                success  function data                           alert data                                         lt  script gt      lt  body gt    lt  html gt    I can t figure it out where I went wrong  could you please tell me what i am doing wrong   Thanks

User · Answer

From the use of 8080 I m assuming you are using a tomcat servlet container to serve your rest api  If this is the case you can also consider to have your webserver proxy the requests to the servlet container   With apache you would typically use mod jk  although there are other alternatives  to serve the api trough the web server behind port 80 instead of 8080 which would solve the cross domain issue   This is common practice  have the  static  content in the webserver and dynamic content in the container  but both served from behind the same domain   The url for the rest api would be http   localhost restws json product get  Here a description on how to use mod jk to connect apache to tomcat  http   tomcat apache org connectors-doc webserver howto apache html

User · Answer

I think there is no need to specify    http   localhost 8080      in the URI part   because  if you specify  it  You ll have to change it manually for every environment    Only     restws json product get  also works

User · Answer

You are running your HTML from a different host than the host you are requesting   Because of this  you are getting blocked by the same origin policy   One way around this is to use JSONP   This allows cross-site requests   In JSON  you are returned    a  5  b  6    In JSONP  the JSON is wrapped in a function call  so it becomes a script  and not an object   callback  a  5  b  6     You need to edit your REST service to accept a parameter called callback  and then to use the value of that parameter as the function name   You should also change the content-type to application javascript   For example  http   localhost 8080 restws json product get callback process should output   process  a  5  b  6     In your JavaScript  you will need to tell jQuery to use JSONP   To do this  you need to append  callback   to the URL     getJSON  http   localhost 8080 restws json product get callback        function data         alert data                     If you use   ajax  it will auto append the  callback   if you tell it to use jsonp     ajax       type   GET      dataType   jsonp      url   http   localhost 8080 restws json product get      success  function data                alert data

[jquery] jQuery ajax call to REST service

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