Revert "IHTTPResult::getContentType is now a string again"

This reverts commit 40b11442

src/Network/CurlResult.php

@@ -37,7 +37,7 @@ class CurlResult implements IHTTPResult
 	private $returnCode;
 
 	/**
-	 * @var string the content type of the Curl call
+	 * @var string[] the content type of the Curl call
 	 */
 	private $contentType;
 
@@ -223,9 +223,9 @@ class CurlResult implements IHTTPResult
 	private function checkInfo()
 	{
 		if (isset($this->info['content_type'])) {
-			$this->contentType = $this->info['content_type'];
+			$this->contentType = [$this->info['content_type']];
 		} else {
-			$this->contentType = '';
+			$this->contentType = [];
 		}
 	}
 

src/Network/GuzzleResponse.php

@@ -88,7 +88,7 @@ class GuzzleResponse extends Response implements IHTTPResult, ResponseInterface
 	/** {@inheritDoc} */
 	public function getContentType()
 	{
-		return implode($this->getHeader('Content-Type'));
+		return $this->getHeader('Content-Type');
 	}
 
 	/** {@inheritDoc} */

src/Network/IHTTPResult.php

@@ -19,7 +19,7 @@ interface IHTTPResult
 	/**
 	 * Returns the Content Type
 	 *
-	 * @return string the Content Type
+	 * @return string[] the Content Types
 	 */
 	public function getContentType();
 

src/Network/Probe.php

@@ -429,7 +429,7 @@ class Probe
 		}
 
 		// If it isn't a HTML file then exit
-		if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
+		if (!in_array('html', $curlResult->getContentType())) {
 			return false;
 		}