php cURL sometimes works, sometimes doesn't - php

Question

I have a strange situation.
I am trying to make curl requests in php. Sometimes it returns valid response, sometimes it returns "HTTP/1.1 401 Unauthorized. One common pattern is, if I wait for long time, 5 minutes between requests it works. If I make a request immediately after each other it fails. (This pattern is not consistent either) But sometimes I can make successful request one after another.
If I make the same request using curl command it works all the time. The verbose between the two are exactly the same.
<?php
$api = new ApiRestTest(URL,LOGIN,APIKEY);
$result = $api->curl_req(CONTACT_TEST);
var_dump($result);
class ApiRestTest
{
protected $_url;
protected $_username;
protected $_apiKey;
public function __construct($url, $username, $apiUserKey) {
$this->_url = $url;
$this->_username = $username;
$this->_apiKey = $apiUserKey;
}
private function getHeader() {
$nonce = base64_encode(substr(md5(uniqid()), 0, 16));;
$created = date('c');
$digest = base64_encode(sha1(base64_decode($nonce) . $created . $this->_apiKey, true));
$wsseHeader[] = "Content-type:application/vnd.api+json";
$wsseHeader[] = "Accept: application/json";
$wsseHeader[] = "Authorization: WSSE profile=\"UsernameToken\"";
$wsseHeader[]= sprintf(
'X-WSSE: UsernameToken Username="%s", PasswordDigest="%s", Nonce="%s", Created="%s"', $this->_username, $digest, $nonce, $created
);
var_dump($wsseHeader);
return $wsseHeader;
}
public function curl_req($path, $data=array())
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->_url . $path);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch, CURLOPT_USERAGENT, 'curl/7.54.0');
curl_setopt($ch, CURLOPT_HTTPHEADER, $this->getHeader());
$data = curl_exec($ch);
curl_close($ch);
return $data;
}}
curl command line output
$ curl -v -H "Content-type:application/vnd.api+json" -H "Accept: application/json" -H 'Authorization: WSSE profile="UsernameToken"' -H 'X-WSSE: UsernameToken Username="system", PasswordDigest="D1jXzXaTxcZDJ6YKvtqkggkhXV8=", Nonce="ODM3ZWVmZTRiY2U0MmIzNQ==", Created="2017-08-30T10:16:55+10:00"' http://orocampus.tk/app.php/api/contacts/2
Trying 45.76.122.100...
TCP_NODELAY set
Connected to orocampus.tk (45.76.122.100) port 80 (#0)
> GET /app.php/api/contacts/2 HTTP/1.1
> Host: orocampus.tk
> User-Agent: curl/7.54.0
> Content-type:application/vnd.api+json
> Accept: application/json
> Authorization: WSSE profile="UsernameToken"
> X-WSSE: UsernameToken Username="system", PasswordDigest="D1jXzXaTxcZDJ6YKvtqkggkhXV8=", Nonce="ODM3ZWVmZTRiY2U0MmIzNQ==", Created="2017-08-30T10:16:55+10:00"
>
< HTTP/1.1 200 OK
< Server: nginx/1.13.3
< Date: Wed, 30 Aug 2017 00:17:17 GMT
< Content-Type: application/vnd.api+json
< Transfer-Encoding: chunked
< Cache-Control: no-cache
< Set-Cookie: SERVERID=web2; path=/
<
* Connection #0 to host orocampus.tk left intact
php output
$ php test.php
array(4) {
[0]=>
string(37) "Content-type:application/vnd.api+json"
[1]=>
string(24) "Accept: application/json"
[2]=>
string(43) "Authorization: WSSE profile="UsernameToken""
[3]=>
string(157) "X-WSSE: UsernameToken Username="system", PasswordDigest="D1jXzXaTxcZDJ6YKvtqkggkhXV8=", Nonce="ODM3ZWVmZTRiY2U0MmIzNQ==", Created="2017-08-30T10:16:55+10:00""
}
* Trying 45.76.122.100...
* TCP_NODELAY set
* Connected to orocampus.tk (45.76.122.100) port 80 (#0)
> GET /app.php/api/contacts/2 HTTP/1.1
Host: orocampus.tk
User-Agent: curl/7.54.0
Content-type:application/vnd.api+json
Accept: application/json
Authorization: WSSE profile="UsernameToken"
X-WSSE: UsernameToken Username="system", PasswordDigest="D1jXzXaTxcZDJ6YKvtqkggkhXV8=", Nonce="ODM3ZWVmZTRiY2U0MmIzNQ==", Created="2017-08-30T10:16:55+10:00"
< HTTP/1.1 401 Unauthorized
< Server: nginx/1.13.3
< Date: Wed, 30 Aug 2017 00:16:53 GMT
< Content-Type: application/json
< Transfer-Encoding: chunked
< Cache-Control: no-cache
< WWW-Authenticate: WSSE realm="Secured API", profile="UsernameToken"
< Set-Cookie: SERVERID=web2; path=/
<
* Connection #0 to host orocampus.tk left intact
string(277) "HTTP/1.1 401 Unauthorized
Server: nginx/1.13.3
Date: Wed, 30 Aug 2017 00:16:53 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Cache-Control: no-cache
WWW-Authenticate: WSSE realm="Secured API", profile="UsernameToken"
Set-Cookie: SERVERID=web2; path=/
I have tried to run curl in php. It also failed
function request($path) {
$curl = "curl -v -H \"Content-type:application/vnd.api+json\" -H \"Accept: application/json\" -H 'Authorization: WSSE profile=\"UsernameToken\"'".
" -H ".$this->getHeader()[3]."' " . $this->_url . $path;
var_dump($curl);
exec($curl, $output, $exit);
var_dump($output);
return $exit == 0;
}
If I run the same curl command in the terminal, it works fine. What is the problem?