Allow httpRequest to send a zuora-version header

1. +++ b/src/Rest/Client.php
   @@ -44,8 +44,8 @@ class Client extends ZuoraClientBase {
   +  public function get($uri, $zuora_version = null) {
   
   @@ -56,8 +56,8 @@ class Client extends ZuoraClientBase {
   +  public function post($uri, array $body, $zuora_version = null) {
   
   @@ -68,8 +68,8 @@ class Client extends ZuoraClientBase {
   +  public function put($uri, array $body, $zuora_version = null) {
   
   @@ -83,10 +83,10 @@ class Client extends ZuoraClientBase {
   +  public function httpRequest($type, $uri, array $body = null, $zuora_version = null) {
   
   @@ -104,13 +104,16 @@ class Client extends ZuoraClientBase {
   +  protected function httpHeaders($zuora_version = null) {
   

   Document blocks not updated.

2. +++ b/src/Rest/Client.php
   @@ -104,13 +104,16 @@ class Client extends ZuoraClientBase {
   +      'zuora-version' => $zuora_version,
   ...
   +    $headers = array_filter($headers);
   

   Why not first just check if it's not null, then add if it has a value versus array filter.

+++ b/src/Rest/Client.php
@@ -40,12 +40,15 @@ class Client extends ZuoraClientBase {
+  public function get($uri, $zuora_version = null) {
+    return $this->httpRequest('GET', $uri, $zuora_version);

@@ -79,14 +88,16 @@ class Client extends ZuoraClientBase {
+  public function httpRequest($type, $uri, array $body = null, $zuora_version = null) {

httpRequest expects a body value. You're sending the Zuora version as the body in GET requests.

+++ b/src/Rest/Client.php
@@ -79,14 +88,16 @@ class Client extends ZuoraClientBase {
     $response = $this->httpClient->request($type, '/' . self::ZUORA_API_VERSION . $uri, [
...
+      'headers' => $this->httpHeaders($zuora_version),

@@ -102,15 +113,23 @@ class Client extends ZuoraClientBase {
+    if($zuora_version != NULL){
+      $headers['zuora-version'] = $zuora_version;
+    }

I know they told us to do this, but why can't we just change the URL?

Can we also provide a constant for the other version?

Thanks!