Re: [Cppcms-users] Can't get correct response from json rpc server when using javascript

[Artyom B. <art...@ya...>]

Actually I don't see any specific reason why wouldn't it work.
Are you sure you don't have Same Origin Policy related errors?

I've added an HTML example of JSON RPC service in the json_rpc examples
directory:

   http://cppcms.svn.sourceforge.net/viewvc/cppcms/framework/trunk/examples/json_rpc/index.html?view=markup

 
Artyom Beilis



>________________________________
>From: 刘怀宇 <mys...@gm...>
>To: cpp...@li...
>Sent: Wednesday, September 7, 2011 11:44 AM
>Subject: [Cppcms-users] Can't get correct response from json rpc server when using javascript
>
>
>Hello There is a json rpc example in cppcms project. Now I want to send json_rpc request  using javascript , but it doesn't work.
> I found that the Content-Type field of the HttpRequest message must be "application/json" for  cppcms application ,otherwise I got error messages as follows  " invalid content type " 
>And I tested  successfully by python(in tests dir) and curl command
>
>
>1.python:
>
>
>def test(name,A,B):
>    if A != B:
>        print "Error :" + name 
>        print "-----Actual--"
>        print A,"---Expected--"
>        print B,"-------------"
>        sys.exit(1)
>    else:
>        print "Ok:"+name
>
>
>def test_status(h,stat):
>    if h.status != stat:
>        print "Status mistmatch:",h.status,"!=",stat
>        sys.exit(1)
>
>
>def test_valid(name,params,ans,method='POST'):
>    h=httplib.HTTPConnection(' 192.168.30.17:8080');
>    headers = {"Content-type": "application/json"}
>    h.request(method,'/rpc',params,headers)
>    r=h.getresponse()
>    test(name,r.read(),ans)
>
>
>test_valid('sum','{"method" : "sum" , "params" : [ 1, 2 ], "id" : 1}','{"id":1,"error":null,"result":3}')
>
>
>2.curl command:
> curl -i -X POST --header "Content-Type:application/json" -d '{"method":"sum","params":[1,2],"id":1}' http://192.168.30.17:8080/rpc
>
>
>They both succeeded.
>
>
>But I can't get correct response by using  javascript.The following code has been tested in IE8 , Chrome13 and firefox6.It only success in IE8.
>
>
>var xhr = new XMLHttpRequest();
>var rpcUrl = 'http://192.168.30.17:8080/rpc';
>var postData = '{"method":"sum","params":[1,2],"id":1}';
>
>xhr.open("post", rpcUrl, true); 
>
>xhr.setRequestHeader("Content-Type","application/json"); 
>
>xhr.onreadystatechange = function() {
>if (xhr.readyState === 4) {
>if (xhr.status >= 200 && xhr.status < 300 || xhr.status === 304) { 
>alert(xhr.responseText) 
>}
>}
>}
>xhr.send(postData); 
>
>
>Maybe the problem is that I can't set the "Content-Type" as "application/json" successfully in Chrome and Firefox.
>
>
>Do you have any experience about ajax?
>Or just give me an idea!
>
>
>
>
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