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Question Nezla · May 16, 2022

Send HTTP request and get a response

#Ensemble

Hi Guys,

is there a sample code where I can basically send a HTTP request given a URL and authentication and handle the JSON response?

Thanks

Product version: Ensemble 2014.1

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Matjaz Murko · May 16, 2022

Hi.

Set request=##class(%Net.HttpRequest).%New()
Set request.Server="something.com"
Set request.Port="some_port"
Set request.Username="some_username"
Set request.Password="some_password"

Set status=request.Get("some_url")
Do request.HttpResponse.Data.Rewind()
Set jsonString=request.HttpResponse.Data.Read(request.HttpResponse.Data.Size,.sc)

Set jsonObject={}.%FromJSON(jsonString)
Write jsonObject."some_property"
...

Something like that...

Regards,
Matjaž

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Nezla May 16, 2022 to Matjaz Murko

Thanks

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Nezla May 17, 2022 to Matjaz Murko

Set jsonObject={}.%FromJSON(jsonString) doesn't seems to work and couldn't find %FromJSON in Docs is this available in Ensemble 2014 which I'm using?

thanks

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Timothy Leavitt · May 16, 2022

Sure, here's one:

set req = ##class(%Net.HttpRequest).%New()
set req.SSLConfiguration="MBTA" // Set this up in the management portal under Security Management > SSL/TSL Configurations; this is the SSLConfig's "Name"
// For HTTP Basic authentication, simple route is e.g.:
set req.Username = "foo"
set req.Password = "bar"
// For other modes, e.g.:
do req.SetHeader("Authorization","Bearer abcd")
set sc = req.Get("https://api-v3.mbta.com/routes")
// TODO: check sc / $$$ThrowOnError(sc)
// TODO: check req.HttpResponse.StatusCode to make sure it's 200 and error handle appropriately
set obj = {}.%FromJSON(req.HttpResponse.Data)
zw obj // There's your object!

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Nezla May 17, 2022 to Timothy Leavitt

sorry also set obj = {}.%FromJSON(req.HttpResponse.Data) is not working, is this available in Ensemble 2014?

Thanks

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Robert Cemper May 17, 2022 to Nezla

I found %DynamicObjects first in Caché 2017.1 Class Ref
https://cedocs.intersystems.com/ens20171/csp/documatic/%25CSP.Documatic.cls?&LIBRARY=%25SYS&CLASSNAME=%25Library.DynamicObject
In 2014 this was somehow buried in %ZAN.Auxilary.???

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Nezla May 17, 2022 to Robert Cemper

mybe you mean this d ##class(%ZEN.Auxiliary.jsonProvider).%ConvertJSONToObject(SampleJsonData,,.list) ,I tried that but I got an empty list?

in all cases, after doing the below, I should be able at lease read the JSON string but I'm getting an html file, so I'm missing something in my code?

set Httprequest = ##class(%Net.HttpRequest).%New()
Set Httprequest.SSLConfiguration="RTLS"
Set Httprequest.Server="serverurl"
Set Httprequest.Https=1
Set Httprequest.Timeout=30
set Httprequest.ContentType="application/json"
Do Httprequest.SetHeader("Accept","text/plain") set Httprequest.Username="user"
set Httprequest.Password="password"
S stat= Httprequest.Get("someurl")

Set Resp=Httprequest.HttpResponse.Data.Read()

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Robert Cemper May 17, 2022 to Nezla

Status= 1 justteslls you tht the HTTP connection was processed OK.
Next you need to take a look into your response object.

set res=Httprequest.HttpResponse
in terminal then ZW res to see in the Status is 200 OK
otherwise what you see I res.Data might be just an error page.
Which is also OK for HTTP but not for your content.

• property ReasonPhrase as %String;

This is the human readable reason that goes with the StatusCode.

• property StatusCode as %Integer;

The HTTP status code. This is useful to determine if the request was successful. Look in the rfc for HTTP to see which codes are supported and what they mean. A human readable form of this code is stored as the ReasonPhrase

• property StatusLine as %String;

The HTTP status line. This is the first line of the response and signals if the request was successful or if there was a problem.

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Nezla · May 17, 2022

So I did the following from the Terminal:

set Httprequest = ##class(%Net.HttpRequest).%New()
Set Httprequest.SSLConfiguration="RTLS"
Set Httprequest.Server="serverurl"
Set Httprequest.Https=1
Set Httprequest.Timeout=30
set Httprequest.ContentType="application/json"
Do Httprequest.SetHeader("Accept","text/plain")

set Httprequest.Username="user"
set Httprequest.Password="password"
S stat= Httprequest.Get("someurl")

W stat
1

so given the status =1 that means everything went ok isn't if not how can I check?

then I did the following to read the JSON file :
Set Resp=Httprequest.HttpResponse.Data.Read()

but when I cheked what's in Resp I get the below html output:

ï»¿<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>IUDEX</title>
<base href="/" />

<link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />
<link href="_content/Smart.Blazor/css/smart.default.css" rel="stylesheet" />

<link href="css/app.css" rel="stylesheet" />

<link href="Galaxy.Client.styles.css" rel="stylesheet" />
</head>
<body>
<style>
.loader-logo {
width: 256px;
}

.loader-container {
flex-direction: column;
flex-wrap: nowrap;
justify-content: center;
align-items: center;
display: flex;
gap: 32px;
height: 512px;
}

.spinner {
border: 5px solid #afafaf;
border-top: 5px solid #e53947;
border-radius: 50%;
width: 32px;
height: 32px;
animation: spin 700ms linear infinite;
}

@keyframes spin {
0% {
transform: rotate(0deg)
}

100% {
transform: rotate(360deg)
}
}
</style>

<div class="loader-container" id="app">
<img class="loader-logo" src="images/logo-dark.svg" />
<div class="spinner"></div>
<div id="blazor-error-ui">
An unhandled error has occurred.
<a href="" class="reload">Reload</a>
<a class="dismiss">ð</a>
</div>
</div>

<script src="_content/MudBlazor/MudBlazor.min.js"></script>

<script src="_content/Smart.Blazor/js/smart.blazor.js"></script>
<script src="_content/Smart.Blazor/js/smart.elements.js"></script>
<script src="_content/Galaxy.DataViewer/canvasjs.min.js"></script>

<script src="_framework/blazor.webassembly.js"></script>
<script src="js/galaxyLib.min.js"></script>

</body>
</html>

I thought I'll be getting a JSON string, FYI I'm supposed to a get a Token in a JSON file?

Thanks

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Matjaz Murko May 17, 2022 to Nezla

Hi.
You are getting pure html, not a JSON serialized string. You need the correct URL/port where the REST server is listening.

Regards,
Matjaž

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