Post request to golang server using polymer core-ajax?

Question

I am trying to make a POST request using polymer core-ajax to server runnung golang. After a lot of search (because i am new to this stuff) i ended up with the following code. Also, GET request is working perfect. POST parameters i dont understand how to pass using core-ajax.

<polymer-element name="register-user" attributes="url">
    <template>
        <core-ajax id="ajaxSubmit" url="{{url}}" contentType="application/json" handleAs="json" method="post" on-core-response="{{response}}"></core-ajax>
        <style type="text/css">
        </style>
    </template>
    <script>
    Polymer({
        buttonListener: function() {
            var data = '{"Name":"'+ this.name +'", "Email":"'+ this.email +'"}';
            this.$.ajaxSubmit.data = data;
            this.$.ajaxSubmit.go();
            console.log(data);
        },
        response: function(oldValue){
            console.log(this.response);
        }
    });
    </script>
</polymer-element>

above code returns 500 (Internal Server Error) however when i make a POST request using curl i.e

curl -i -H 'Content-Type: application/json' -d '{"Name":"Batman",    
     "Email":"[email protected]"}' http://so.me.ip.ad:8080/register

it works as it should and returns

HTTP/1.1 200 OK
Content-Type: application/json
X-Powered-By: go-json-rest
Date: Wed, 29 Apr 2015 05:40:15 GMT
Content-Length: 117

{
  "id": 3,
  "name": "Batman",
  "email": "[email protected]",
  "createdAt": "2015-04-29T05:40:15.073491143Z"
}

also, i have a CORS middleware set up on server i.e

api.Use(&rest.CorsMiddleware{
    RejectNonCorsRequests: false,
    OriginValidator: func(origin string, request *rest.Request) bool {
        return origin == "http://0.0.0.0:8000"
    },
    AllowedMethods: []string{"GET", "POST", "PUT"},
    AllowedHeaders: []string{
        "Accept", "Content-Type", "X-Custom-Header", "Origin"},
    AccessControlAllowCredentials: true,
    AccessControlMaxAge:           3600,
})

What am i doing wrong? Any feedback will be of great help! Thanks ^.^

Edit : here is a little more info if it can help.. screenshot

Browsers usually also send headers like "User-Agent" and "Referer" and those are not listed as allowed headers in your CORS middelware - perhaps thats the problem? — ain
– ain, Commented Apr 29, 2015 at 6:50
@ain i added "User-Agent" and "Referer" as AllowedHeaders but still get a 500 in response :( — Kushal Sharma
– Kushal Sharma, Commented Apr 29, 2015 at 7:15
What go packages do you use ? Try dumping (in the Go server) the complete request (e.g : all Headers and content) to inspect what is different between your curl request and your polymer request. — LeGEC
– LeGEC, Commented Apr 29, 2015 at 10:26
Did you try setting 'Access-Control-Allow-Origin' header to '*'? — Alexander Weber
– Alexander Weber, Commented Apr 29, 2015 at 16:28
Does it help setting the headers?this.$.ajax.headers='{"X-Requested-With": "XMLHttpRequest"'}; — Niels
– Niels, Commented Apr 30, 2015 at 23:34

Community · Accepted Answer · 2017-05-23 12:01:18Z

2

I think CORS is a red herring. The problem may be that you are sending the data form-encoded and not as json. I found a bug from a user with a similar problem.

HTTP/1.1 500 Internal Server Error
Content-Type: application/json
X-Powered-By: go-json-rest
Date: Fri, 12 Dec 2014 04:29:59 GMT
Content-Length: 71

{
  "Error": "invalid character '\\'' looking for beginning of value"
}

Perhaps you should use .body instead of .data? See this answer.

From the polymer documentation:

body: Optional raw body content to send when method === "POST".

Example:

<core-ajax method="POST" auto url="http://somesite.com"
    body='{"foo":1, "bar":2}'>
</core-ajax>

edited May 23, 2017 at 12:01

CommunityBot

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answered May 1, 2015 at 4:34

Caleb

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1 Comment

Kushal Sharma Over a year ago

Thanks, that worked! i had to work around CORS though (moved my polymer code on same domain)

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