Fetching remote XML from URL using Dart / Flutter

Question

I'm having trouble pulling XML data from a url. When I use http.get and print out the response.body - it looks like regular JSON. One of this issues is some of the XML nodes have attributes on them that I need to use. I'm still fairly new to Dart / Flutter so any help is REALLY appreciated. Here's my code for reference:

  String url = "url_to_data_remote_data";

  Future<DataModel> fetchData() async {
    final response = await http.get(url);

    if (response.statusCode == 200) 
      return DataModel.fromXML(response.body);
    } else {
      throw Exception('Failed to load post');
    }
  }

so the body looks like JSON but you expect XML ? Is this a hybrid webservice that sends out the content depending on your ACCEPT http header? So perhaps it can do both JSON and XML depending on the client. — Logemann
– Logemann, Commented Nov 14, 2019 at 14:11
I'll try that, but in the event it's not a hybrid service - is there a way to consume XML in Dart / Flutter? — Nate
– Nate, Commented Nov 14, 2019 at 14:27
as to my knowledge http.get doesnt transform the content to something else — Logemann
– Logemann, Commented Nov 14, 2019 at 14:29

Nate · Accepted Answer · 2019-11-14 16:09:13Z

2

Figured it out thanks to @Marc's comments; didn't know a hybrid service was a thing.

Essentially you need to set a header to accept xml. These are the lines of code that fixed my issue:

    Map<String, String> headers = {"Accept": "text/html,application/xml"};
    final response = await http.get(url, headers: headers);

answered Nov 14, 2019 at 16:09

Nate

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3 Comments

FilipeOS Over a year ago

Hi @Nate, I get Invalid argument(s): Unsupported scheme because the xml I get don't have the <xml> tag, can you help me?

Nate Over a year ago

I’ll look it over today and let you know what I can figure out

FilipeOS Over a year ago

Sorry, I was trying with // and not http:// BUT when I get to my code on github I get "<" expected at 1:1

Mohamad Assem Nasser · Accepted Answer · 2019-11-14 14:55:26Z

1

You can use xml package to read the XML fetched. Then, you can use it however you like.

If you prefer working with JSON, which I recommend, use xml2json package to convert XML to JSON. handling JSON is easier in dart than handling XML.

answered Nov 14, 2019 at 14:55

Mohamad Assem Nasser

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1 Comment

Nate Over a year ago

the XML I'm using has attributes on that'll be used at a later time so xml2json may not suit the ticket requirements but I'll keep it on my radar.

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