diff --git a/src/Content/Text/BBCode.php b/src/Content/Text/BBCode.php
index 5256c3c8ae..594cd9a6ce 100644
--- a/src/Content/Text/BBCode.php
+++ b/src/Content/Text/BBCode.php
@@ -491,8 +491,8 @@ class BBCode
 				}
 
 				$i = $curlResult->getBody();
-				$contType = $curlResult->getContentType();
-				$type = Images::getMimeTypeByData($i, $mtch[1], $contType);
+				$type = $curlResult->getContentType();
+				$type = Images::getMimeTypeByData($i, $mtch[1], $type);
 
 				if ($i) {
 					$Image = new Image($i, $type);
diff --git a/src/Model/Photo.php b/src/Model/Photo.php
index dc60f25f37..6380f42789 100644
--- a/src/Model/Photo.php
+++ b/src/Model/Photo.php
@@ -424,17 +424,16 @@ class Photo
 		if (!empty($image_url)) {
 			$ret = DI::httpRequest()->get($image_url, true);
 			$img_str = $ret->getBody();
-			$contType = $ret->getContentType();
+			$type = $ret->getContentType();
 		} else {
 			$img_str = '';
-			$contType = [];
 		}
 
 		if ($quit_on_error && ($img_str == "")) {
 			return false;
 		}
 
-		$type = Images::getMimeTypeByData($img_str, $image_url, $contType);
+		$type = Images::getMimeTypeByData($img_str, $image_url, $type);
 
 		$Image = new Image($img_str, $type);
 		if ($Image->isValid()) {
diff --git a/src/Model/User.php b/src/Model/User.php
index 48d9348961..68c42e40e0 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -1005,13 +1005,13 @@ class User
 			$curlResult = DI::httpRequest()->get($photo, true);
 			if ($curlResult->isSuccess()) {
 				$img_str = $curlResult->getBody();
-				$contType = $curlResult->getContentType();
+				$type = $curlResult->getContentType();
 			} else {
 				$img_str = '';
-				$contType = [];
+				$type = '';
 			}
 
-			$type = Images::getMimeTypeByData($img_str, $photo, $contType);
+			$type = Images::getMimeTypeByData($img_str, $photo, $type);
 
 			$Image = new Image($img_str, $type);
 			if ($Image->isValid()) {
diff --git a/src/Network/CurlResult.php b/src/Network/CurlResult.php
index 4ecdd68d10..b2eefcbaa9 100644
--- a/src/Network/CurlResult.php
+++ b/src/Network/CurlResult.php
@@ -245,7 +245,7 @@ class CurlResult implements IHTTPResult
 	public function getHeader($header)
 	{
 		if (empty($header)) {
-			return [];
+			return '';
 		}
 
 		$header = strtolower(trim($header));
@@ -256,7 +256,7 @@ class CurlResult implements IHTTPResult
 			return $headers[$header];
 		}
 
-		return [];
+		return '';
 	}
 
 	/** {@inheritDoc} */
@@ -289,11 +289,7 @@ class CurlResult implements IHTTPResult
 			$parts = explode(':', $line);
 			$headerfield = strtolower(trim(array_shift($parts)));
 			$headerdata = trim(implode(':', $parts));
-			if (empty($this->header_fields[$headerfield])) {
-				$this->header_fields[$headerfield] = [$headerdata];
-			} elseif (!in_array($headerdata, $this->header_fields[$headerfield])) {
-				$this->header_fields[$headerfield][] = $headerdata;
-			}
+			$this->header_fields[$headerfield] = $headerdata;
 		}
 
 		return $this->header_fields;
diff --git a/src/Network/IHTTPResult.php b/src/Network/IHTTPResult.php
index acee2dde98..77ee86976b 100644
--- a/src/Network/IHTTPResult.php
+++ b/src/Network/IHTTPResult.php
@@ -19,7 +19,7 @@ interface IHTTPResult
 	/**
 	 * Returns the Content Type
 	 *
-	 * @return string[] the Content Types
+	 * @return string the Content Type
 	 */
 	public function getContentType();
 
@@ -29,7 +29,7 @@ interface IHTTPResult
 	 *
 	 * @param string $header optional header field. Return all fields if empty
 	 *
-	 * @return string[] the headers or the specified content of the header variable
+	 * @return string the headers or the specified content of the header variable
 	 */
 	public function getHeader($header);
 
diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 14dcdea336..cfd0368439 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -429,7 +429,7 @@ class Probe
 		}
 
 		// If it isn't a HTML file then exit
-		if (!in_array('html', $curlResult->getContentType())) {
+		if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
 			return false;
 		}
 
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index 1d95a6f3a4..ef38aaebe3 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -747,7 +747,7 @@ class OStatus
 		$xml = '';
 
 		if ($curlResult->inHeader('Content-Type') &&
-			in_array('application/atom+xml', $curlResult->getHeader('Content-Type'))) {
+			stristr($curlResult->getHeader('Content-Type'), 'application/atom+xml')) {
 			$xml = $curlResult->getBody();
 		}
 
@@ -941,7 +941,7 @@ class OStatus
 		$xml = '';
 
 		if ($curlResult->inHeader('Content-Type') &&
-			in_array('application/atom+xml', $curlResult->getHeader('Content-Type'))) {
+			stristr($curlResult->getHeader('Content-Type'), 'application/atom+xml')) {
 			Logger::log('Directly fetched XML for URI ' . $related_uri, Logger::DEBUG);
 			$xml = $curlResult->getBody();
 		}
diff --git a/src/Util/Images.php b/src/Util/Images.php
index f0aefb9f2c..f39b0db00d 100644
--- a/src/Util/Images.php
+++ b/src/Util/Images.php
@@ -75,25 +75,23 @@ class Images
 	/**
 	 * Fetch image mimetype from the image data or guessing from the file name
 	 *
-	 * @param string   $image_data Image data
-	 * @param string   $filename   File name (for guessing the type via the extension)
-	 * @param string[] $mimeTypes  possible mime types
+	 * @param string $image_data Image data
+	 * @param string $filename   File name (for guessing the type via the extension)
+	 * @param string $mime       default mime type
 	 *
 	 * @return string
 	 * @throws \Exception
 	 */
-	public static function getMimeTypeByData(string $image_data, string $filename = '', array $mimeTypes = [])
+	public static function getMimeTypeByData(string $image_data, string $filename = '', string $mime = '')
 	{
-		foreach ($mimeTypes as $mimeType) {
-			if (substr($mimeType, 0, 6) == 'image/') {
-				Logger::info('Using default mime type', ['filename' => $filename, 'mime' => $mimeTypes]);
-				return $mimeType;
-			}
+		if (substr($mime, 0, 6) == 'image/') {
+			Logger::info('Using default mime type', ['filename' => $filename, 'mime' => $mime]);
+			return $mime;
 		}
 
 		$image = @getimagesizefromstring($image_data);
 		if (!empty($image['mime'])) {
-			Logger::info('Mime type detected via data', ['filename' => $filename, 'default' => $mimeTypes, 'mime' => $image['mime']]);
+			Logger::info('Mime type detected via data', ['filename' => $filename, 'default' => $mime, 'mime' => $image['mime']]);
 			return $image['mime'];
 		}
 
diff --git a/src/Util/ParseUrl.php b/src/Util/ParseUrl.php
index ee2bedd1ee..1a81a256ca 100644
--- a/src/Util/ParseUrl.php
+++ b/src/Util/ParseUrl.php
@@ -166,7 +166,7 @@ class ParseUrl
 		}
 
 		// If it isn't a HTML file then exit
-		if (!in_array('html', $curlResult->getContentType())) {
+		if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
 			return $siteinfo;
 		}
 
@@ -198,10 +198,8 @@ class ParseUrl
 		$charset = '';
 		// Look for a charset, first in headers
 		// Expected form: Content-Type: text/html; charset=ISO-8859-4
-		foreach ($curlResult->getContentType() as $type) {
-			if (preg_match('/charset=([a-z0-9-_.\/]+)/i', $type, $matches)) {
-				$charset = trim(trim(trim(array_pop($matches)), ';,'));
-			}
+		if (preg_match('/charset=([a-z0-9-_.\/]+)/i', $curlResult->getContentType(), $matches)) {
+			$charset = trim(trim(trim(array_pop($matches)), ';,'));
 		}
 
 		// Then in body that gets precedence
diff --git a/tests/datasets/curl/about.head.php b/tests/datasets/curl/about.head.php
index b7773b81af..d0be0feb4f 100644
--- a/tests/datasets/curl/about.head.php
+++ b/tests/datasets/curl/about.head.php
@@ -1,20 +1,20 @@
 <?php
 
 return [
-	'http/2 200' => [''],
-    'date' => ['Thu, 11 Oct 2018 18:43:54 GMT'],
-    'content-type' => ['text/html; charset=utf-8'],
-    'vary' => ['Accept-Encoding'],
-    'server' => ['Mastodon'],
-    'x-frame-options' => ['DENY', 'SAMEORIGIN'],
-    'x-content-type-options' => ['nosniff'],
-    'x-xss-protection' => ['1; mode=block'],
-    'etag' => ['W/"706e6c48957e1d46ecf9d7597a7880af"'],
-    'cache-control' => ['max-age=0, private, must-revalidate'],
-    'set-cookie' => ['_mastodon_session=v3kcy%2FW3aZYBBvZUohuwksEKwzYIyEUlEuJ1KqTAfWPKvVQq%2F4UuJ39zp621VyfpQNlvY46TL%2FYutzXowSLYQBNFCJcrEiF04aU0TdtHls9zynMiyeHhoVgCijOXWXNt9%2FCmpQ49RkNEujkv9NaJ0cum32MCVZKjE9%2BMKmLM%2F8ZygZeLBGJ7sg%3D%3D--QGIiU0%2FpXc3Aym8F--he2iRRPePOdtEs3z%2BufSXg%3D%3D; path=/; secure; HttpOnly'],
-    'x-request-id' => ['a0c0b8e7-cd60-4efa-b79b-cf1b0d5a0784'],
-    'x-runtime' => ['0.049566'],
-    'strict-transport-security' => ['max-age=31536000; includeSubDomains; preload'],
-    'referrer-policy' => ['same-origin'],
-    'content-security-policy' => ["frame-ancestors 'none'; script-src 'self'; object-src 'self'; img-src * data: blob:; media-src 'self' data:; font-src 'self' data: https://fonts.gstatic.com/; connect-src 'self' blob: wss://mastodonten.de"],
+	'http/2 200' => '',
+    'date' => 'Thu, 11 Oct 2018 18:43:54 GMT',
+    'content-type' => 'text/html; charset=utf-8',
+    'vary' => 'Accept-Encoding',
+    'server' => 'Mastodon',
+    'x-frame-options' => 'SAMEORIGIN',
+    'x-content-type-options' => 'nosniff',
+    'x-xss-protection' => '1; mode=block',
+    'etag' => 'W/"706e6c48957e1d46ecf9d7597a7880af"',
+    'cache-control' => 'max-age=0, private, must-revalidate',
+    'set-cookie' => '_mastodon_session=v3kcy%2FW3aZYBBvZUohuwksEKwzYIyEUlEuJ1KqTAfWPKvVQq%2F4UuJ39zp621VyfpQNlvY46TL%2FYutzXowSLYQBNFCJcrEiF04aU0TdtHls9zynMiyeHhoVgCijOXWXNt9%2FCmpQ49RkNEujkv9NaJ0cum32MCVZKjE9%2BMKmLM%2F8ZygZeLBGJ7sg%3D%3D--QGIiU0%2FpXc3Aym8F--he2iRRPePOdtEs3z%2BufSXg%3D%3D; path=/; secure; HttpOnly',
+    'x-request-id' => 'a0c0b8e7-cd60-4efa-b79b-cf1b0d5a0784',
+    'x-runtime' => '0.049566',
+    'strict-transport-security' => 'max-age=31536000; includeSubDomains; preload',
+    'referrer-policy' => 'same-origin',
+    'content-security-policy' => "frame-ancestors 'none'; script-src 'self'; object-src 'self'; img-src * data: blob:; media-src 'self' data:; font-src 'self' data: https://fonts.gstatic.com/; connect-src 'self' blob: wss://mastodonten.de",
 ];
diff --git a/tests/datasets/curl/about.redirect.php b/tests/datasets/curl/about.redirect.php
index f01689aadc..5ae3fd88f7 100644
--- a/tests/datasets/curl/about.redirect.php
+++ b/tests/datasets/curl/about.redirect.php
@@ -1,21 +1,21 @@
 <?php
 
 return [
-	'http/2 301' => [''],
-    'date' => ['Thu, 11 Oct 2018 18:43:54 GMT'],
-    'content-type' => ['text/html; charset=utf-8'],
-    'vary' => ['Accept-Encoding'],
-    'server' => ['Mastodon'],
-    'location' => ['https://test.other/some/'],
-    'x-frame-options' => ['DENY', 'SAMEORIGIN'],
-    'x-content-type-options' => ['nosniff'],
-    'x-xss-protection' => ['1; mode=block'],
-    'etag' => ['W/"706e6c48957e1d46ecf9d7597a7880af"'],
-    'cache-control' => ['max-age=0, private, must-revalidate'],
-    'set-cookie' => ['_mastodon_session=v3kcy%2FW3aZYBBvZUohuwksEKwzYIyEUlEuJ1KqTAfWPKvVQq%2F4UuJ39zp621VyfpQNlvY46TL%2FYutzXowSLYQBNFCJcrEiF04aU0TdtHls9zynMiyeHhoVgCijOXWXNt9%2FCmpQ49RkNEujkv9NaJ0cum32MCVZKjE9%2BMKmLM%2F8ZygZeLBGJ7sg%3D%3D--QGIiU0%2FpXc3Aym8F--he2iRRPePOdtEs3z%2BufSXg%3D%3D; path=/; secure; HttpOnly'],
-    'x-request-id' => ['a0c0b8e7-cd60-4efa-b79b-cf1b0d5a0784'],
-    'x-runtime' => ['0.049566'],
-    'strict-transport-security' => ['max-age=31536000; includeSubDomains; preload'],
-    'referrer-policy' => ['same-origin'],
-    'content-security-policy' => ["frame-ancestors 'none'; script-src 'self'; object-src 'self'; img-src * data: blob:; media-src 'self' data:; font-src 'self' data: https://fonts.gstatic.com/; connect-src 'self' blob: wss://mastodonten.de"],
+	'http/2 301' => '',
+    'date' => 'Thu, 11 Oct 2018 18:43:54 GMT',
+    'content-type' => 'text/html; charset=utf-8',
+    'vary' => 'Accept-Encoding',
+    'server' => 'Mastodon',
+    'location' => 'https://test.other/some/',
+    'x-frame-options' => 'SAMEORIGIN',
+    'x-content-type-options' => 'nosniff',
+    'x-xss-protection' => '1; mode=block',
+    'etag' => 'W/"706e6c48957e1d46ecf9d7597a7880af"',
+    'cache-control' => 'max-age=0, private, must-revalidate',
+    'set-cookie' => '_mastodon_session=v3kcy%2FW3aZYBBvZUohuwksEKwzYIyEUlEuJ1KqTAfWPKvVQq%2F4UuJ39zp621VyfpQNlvY46TL%2FYutzXowSLYQBNFCJcrEiF04aU0TdtHls9zynMiyeHhoVgCijOXWXNt9%2FCmpQ49RkNEujkv9NaJ0cum32MCVZKjE9%2BMKmLM%2F8ZygZeLBGJ7sg%3D%3D--QGIiU0%2FpXc3Aym8F--he2iRRPePOdtEs3z%2BufSXg%3D%3D; path=/; secure; HttpOnly',
+    'x-request-id' => 'a0c0b8e7-cd60-4efa-b79b-cf1b0d5a0784',
+    'x-runtime' => '0.049566',
+    'strict-transport-security' => 'max-age=31536000; includeSubDomains; preload',
+    'referrer-policy' => 'same-origin',
+    'content-security-policy' => "frame-ancestors 'none'; script-src 'self'; object-src 'self'; img-src * data: blob:; media-src 'self' data:; font-src 'self' data: https://fonts.gstatic.com/; connect-src 'self' blob: wss://mastodonten.de",
 ];