Getting json data from HTTP URL

Firmware
1

hi,

to get data from http url I have wrote following method:

String DownloadJson(String url){
    String output;
    if(client.connect(host, serverPort)) {
        client.println("GET "+url+" HTTP/1.0");
        client.println("Host: " + host);
        client.printlnf("Content-Length: %d", 2);
        client.println("Content-Type: application/json");
        client.println();
        client.flush();
        delay(5000);
        while(client.available()) {
            char c = client.read();
            output = output + c;
        }  
    } 
    return output;
}

however in response I get additional info along with response
e.g. HTTP/1.1 200 OK Connection: close Date: Sat, 01 Feb 2020 10:46:47 GMT Content-Type: application/json; charset=utf-8 Server: Kestrel X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN [7,9,10,11]

how do I skip the extra info and get only [7,9,10,11]

-nitin

2

You just discard everything up to a known starting indicator (e.g. \r\n\r\n[)

3

do we have any particle library to skip those HTTP headers?

4

The headers are coming back from Kestral, your web server, you’d have to parse out the response yourself in that case. Options would include changing out Kestral with a true tcp/ip cleint. You could also write a proxy to go between raw port communication and http communication, allowing it to strp out the contents you don’t want before the response.

Honestly, it’s just a bit of string manipulation, if you don’t care about the side of the payload being returned to the device.

5

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