PHP JSON-RPC - invalid method

Question

Doing POST of JSON data using PHP curl. However, every time data is submitted, error message is displayed:

{ "result" : null, "error":"Invalid method", "id": default, "jsonrpc": "2.0"" }

Of course, my first step was to submit data via browser using Live HTTP Headers plugin, so I can see how raw data looks like:

{"jsonrpc":"2.0","method":"get","id":1,"params":["2145359"]}

So I use this code to format my data:

$post_info=json_encode(array("jsonrpc"=>"2.0","method"=>"get","id"=>1,"params"=>array("2145359")), JSON_UNESCAPED_SLASHES)

When I echo my PHP data, it looks identical:

{"jsonrpc":"2.0","method":"get","id":1,"params":["2145359"]}

Then I use this curl function to post data:

$ch=curl_init();
curl_setopt($ch, CURLOPT_URL, some_post_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_info);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
$result=curl_exec($ch);
curl_close($ch);
return $result;

...and "invalid method" error comes. Any suggestions?

I have no idea, this is the complete messages that comes from remote server — Mindaugas Li
– Mindaugas Li, Commented Jan 19, 2017 at 22:53
Magnus, thanks for your suggestion, it's good one. However, data is actually posted (browser posts data, and it works fine), not very sure why "get" is used inside post parameters. — Mindaugas Li
– Mindaugas Li, Commented Jan 19, 2017 at 23:00
Just tried not encoding and sending as array. A different error came - "error":"undefined method `values' for "Array":String" — Mindaugas Li
– Mindaugas Li, Commented Jan 19, 2017 at 23:17
Ah. Of course. Sorry, bad suggestion. Try using http_build_query() instead of json_encode. I forgot that CURL_OPTFIELDS needs a string, not an array. — M. Eriksson
– M. Eriksson, Commented Jan 19, 2017 at 23:26

M. Eriksson · Accepted Answer · 2017-01-19 23:37:28Z

1

Post the data as a "normal" post instead of a json string.

To convert an array into post data to be used with curl and CURLOPT_POSTFIELDS, you can use http_build_query() method.

Example:

$post_info = http_build_query(array(
    "jsonrpc" => "2.0",
    "method"  => "get",
    "id"      => 1,
    "params"  => array(
          "2145359"
    )
));

answered Jan 19, 2017 at 23:37

M. Eriksson

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