Content-Length undefined ? Weird error using Yahoo's PlaceSpotter sample php code

Question

I am currently using the following code:

<?php
/* Pre-requisite: Download the required PHP OAuth class from http://oauth.googlecode.com/svn/code/php/OAuth.php. This is used below */
require("OAuth.php");
$url = "https://yboss.yahooapis.com/geo/placespotter";
$cc_key = "MY_KEY";
$cc_secret = "MY_SECRET";
$text = "EYES ON LONDON Electric night in 100-meter dash";

$args = array();
$args["documentType"] = urlencode("text/plain");
$args["documentContent"] = urlencode($text);

$consumer = new OAuthConsumer($cc_key, $cc_secret);
$request = OAuthRequest::from_consumer_and_token($consumer, NULL,"POST", $url,$args);
$request->sign_request(new OAuthSignatureMethod_HMAC_SHA1(), $consumer, NULL);
$url = sprintf("%s?%s", $url, OAuthUtil::build_http_query($args));
$ch = curl_init();
$headers = array($request->to_header());//.',Content-Length: '.strlen($text));

//print_r($headers.',Content-Length: '.strlen($text));

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
// somehow this line is not solving the issue
// curl_setopt($ch,CURLOPT_HTTPHEADER,array('Content-Length:'.strlen($text)));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$rsp = curl_exec($ch);
print_r($rsp);
//echo "======= ENDING";
?>

With my own access keys and all, with the OAuth.php library.

Somehow I kept getting a Content-Length undefined error.

If I were to attempt to define Content-Length like this ( based on some answers seen here on StackOverFlow:

curl_setopt($ch,CURLOPT_HTTPHEADER,array('Content-Length:'.strlen($text)));

I do not get any response.

May I know how can this issue be solved?

Thanks!

PS: the php example comes from the official example: https://gist.github.com/ydn/bcf8b301125c8ffa986f#file-placespotter-php

---

LATEST EDIT

I've updated my code based on @alexblex's comment

    <?php
/* Pre-requisite: Download the required PHP OAuth class from http://oauth.googlecode.com/svn/code/php/OAuth.php. This is used below */
require("OAuth.php");
$url = "https://yboss.yahooapis.com/geo/placespotter";
$cc_key = "MY_KEY";
$cc_secret = "MY_SECRET";
$text = "EYES ON LONDON Electric from Singapore Raffles Place";
$args = array();
$args["documentType"] = urlencode("text/plain");
$args["documentContent"] = urlencode($text);
$args["outputType"] = "json";
$consumer = new OAuthConsumer($cc_key, $cc_secret);
$request = OAuthRequest::from_consumer_and_token($consumer, NULL,"PUT", $url, $args);
$request->sign_request(new OAuthSignatureMethod_HMAC_SHA1(), $consumer, NULL);
$url = sprintf("%s?%s", $url, OAuthUtil::build_http_query($args));
$ch = curl_init();
$headers = array($request->to_header());//.',Content-Length: '.strlen($text));
//$headers = array($request->to_header().',Content-Length="'.strlen($text).'"');
//$headers = array($request->to_header().',Content-Length: 277');
print_r($headers);
//print_r($headers.',Content-Length: '.strlen($text));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POSTFIELDS, $request->to_postdata());
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$rsp = curl_exec($ch);
echo "\n\n\n\n";
var_dump($rsp);
//print_r($rsp);
?>

Currently, this new code returns a

{"bossresponse":{"responsecode":"500","reason":"non 200 status code from backend: 415"}

error.

Answer 1

You send no POST data, hence no Content-Length being sent. To make a correct curl request you need to specify which data you like to send. In your case it is likely to be:

curl_setopt($ch, CURLOPT_POSTFIELDS, $request->to_postdata());

IF it should be a POST request. The PlaceSpotter docs reads:

The PlaceSpotter Web service supports only the HTTP PUT method. Other HTTP methods are not supported.

So I assume it should be PUT method instead:

$request = OAuthRequest::from_consumer_and_token($consumer, NULL,"PUT", $url,$args);
....
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');

EDIT for 415 response code

It may be an issue with double urlencodeing.

Try to set arguments as unencoded text:

$args["documentType"] = "text/plain";
$args["documentContent"] = $text;