HttpBuilder.request()

[Desmond]

Hi all,

This is my first attempt to make a REST call to retrieve a point values array via Mango scripting source.

Via Swagger:
url:
http://localhost:8080/rest/v2/point-values/multiple-arrays/latest/DP_422050,CDP_614346?limit=3&useCache=NONE

result:

{
  "DP_422050": [
    {
      "timestamp": 1567738483443,
      "value": 175.51602162739323
    },
    {
      "timestamp": 1567738423443,
      "value": 175.16915149128016
    },
    {
      "timestamp": 1567738363443,
      "value": 174.31921651479684
    }
  ],
  "DP_614346": [
    {
      "timestamp": 1567738483443,
      "value": 211795
    },
    {
      "timestamp": 1567738423443,
      "value": 211790
    },
    {
      "timestamp": 1567738363443,
      "value": 211785
    }
  ]
}

Via Mango scripting data source:

print(HttpBuilder.request({
    path: "http://localhost:8080/rest/v2/point-values/multiple-arrays/latest/DP_422050,DP_614346",
    method: "GET",
    headers : {
     "Cookie": "XSRF-TOKEN=6ac16488-db6d-4e64-8353-2faea1433e0f",
     "X-XSRF-TOKEN": "6ac16488-db6d-4e64-8353-2faea1433e0f",
     "Content-Type":"application/json;charset=UTF-8",
     "Host": "localhost:8080",
     "Accept": "application/json, text/plain"
     
  },
    parameters: {
    "limit" : 3,
    "useCache" : "None",
 },
    //content: "GETs don't have content!",
    err: function(status, headers, content) { //errorCallback for linguistic completion
        throw "Request got bad response: " + status;
    },
    resp: function(status, headers, content) { //responseCallback
        //try to retrieve the HttpBuilder object but no success
        //var result = JSON.parse(headers);
        //print(result);
        
        print(content);
        return true; //will print in wrapping print()
    },
    excp: function(exception) { //exceptionCallback
        throw exception.getMessage();
    }
}));

result:
null

I also tried to retrieve the headers for a check test but no success. After some thought, I realize this might due to the "GETs don't have content". If this is the situation, how then can I access the point values array from return HttpBuilder object?

Likelihood I am unable to grasp the concept of HttpBuilder correctly and hopefully someone can help me out on the silly mistake I may have overlooked.

Thanks and Best Regards

[phildunlap]

Hi Desmond,

It seems the first issue is a class cast exception for the excp function. You can remove this function and the err function will be used instead with status code -1. Thanks for bringing this to our attention! https://github.com/infiniteautomation/ma-core-public/issues/1489

After that, I also had to modify the "useCache": "None" to be "useCache": "NONE" (other options are CACHE_ONLY and BOTH )and I used an authorization token in my testing. This worked for me:

var token = "token value from users page"

print(HttpBuilder.request({
    path: "http://localhost:8080/rest/v2/point-values/multiple-arrays/latest/DP_755013cd-03e3-4e9b-aad1-7a4575e58ebd",
    method: "GET",
    headers : {
     "Authorization":"Bearer "+token,
     "Content-Type":"application/json;charset=UTF-8",
     "Host": "localhost:8080",
     "Accept": "application/json, text/plain"
     
  },
    parameters: {
    "limit" : 3,
    "useCache" : "NONE"
 },
    //content: "GETs don't have content!",
    err: function(status, headers, content) { //errorCallback for linguistic completion
        throw "Request got bad response: " + status + " " +content;
    },
    resp: function(status, headers, content) { //responseCallback
        //try to retrieve the HttpBuilder object but no success
        //var result = JSON.parse(headers);
        //print(result);
        
        print(content);
        return true; //will print in wrapping print()
    }
}));

[Desmond]

@phildunlap
Thank you for your prompt reply. It works like a breeze.

In my opinion, this is a powerful tool that open up the doors to communicate with internet of things / web content. In addition it provide flexibility to integrate your creativity into application.

"Logic will get you from A to B. Imagination will take you everywhere".