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Jimmy Christian · Jul 10, 2019

OpenWeathermap http error when making REST call

#HTML #REST API #Caché #Ensemble

Hello ,

I am trying to make a REST call using the example given in documentation for Creating REST Services and Clients with Ensemble.

Class Test.REST.WeatherOperation Extends EnsLib.REST.Operation

But i receive below mentioned error. If anyone can help me out here.

 

ERROR <Ens>ErrGeneral: ERROR <Ens>ErrHTTPStatus: Received non-OK status 404 from remote HTTP server: 'HTTP/1.1 404 Not Found':<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx</center>
</body>
</html>

 

Thanks,

Jimmy Christian.

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Robert Cemper · Jul 10, 2019

it's not related to ENS . the error is pure HTTP

<Ens>ErrHTTPStatus: Received non-OK status 404 from remote HTTP server: 'HTTP/1.1 404 Not Found':<html>

simply tells you that your URL is wrong.

try it in browser to verify it exists

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Jimmy Christian · Jul 10, 2019

Yes, Thank you. I just corrected the URL and it works now. Thank you Robert.  One more question if you can assist in this context.

So the response message i got back is in the HttpResponse object.

How can i convert the HttpResponse.Data property to JSON and parse the values. Since the data i received is Stream, is there a way i can convert the stream to Dynamic Objects and parse  it?

Thank you.

Jimmy Christian.

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Robert Cemper · Jul 10, 2019

the data property is a standard HTML page.
I'm not aware of some function in Caché that converts HTML to JSON.

But asking Google "convert HTML to JSON"  shows that this a standard feature in JavaScript. 
so I see 2 options:

- write your own parser (or someone in the community has done this before ???) 

- call an external tool (eg. node.js) to it for you

see:   https://stackoverflow.com/questions/34504050/how-to-convert-selected-html-to-json

or  https://stackoverflow.com/questions/12980648/map-html-to-json

or https://stackoverflow.com/questions/43469412/convert-html-source-code-to-json-object

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Eduard Lebedyuk · Jul 11, 2019

What version are you on? If 2016.2+ then you can convert JSON stream to dynamic object via:

set dynObj = {}.%FromJSON(req.HttpResponse.Data)
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Jimmy Christian · Jul 11, 2019

Hello Eduard,

i was able to convert the HttpResponse.Data to String and than to the Dynamic Object. Worked great. Thank you.

On the same line, i need to ask you of any template or suggestion to send a JSON data to a REST API.

For eg. below is the JSON

{"name":"abcdefghi","salary":"123","age":"23"}

How do i send it to  http://testing.restapiexample.com/api/v1/createemployee with POST request using the set tSC=..Adapter.PostURL(tConfig.URL,.tHTTPResponse,,pRequest)

Below code is not working.

Set pRequest=."{"name":"abcdefghi","salary":"123","age":"23" }"

Your help will be appreciated.

Thanks,

Jimmy Christian.

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Eduard Lebedyuk · Jul 11, 2019

i was able to convert the HttpResponse.Data to String and than to the Dynamic Object

You don't need to convert to string, pass stream to FromJSON method and it would work.

send a JSON data to a REST API.

Set tAge = 23
Set pRequest= {"name":"abcdefghi","salary":123,"age":(tAge) }
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