diff --git a/src/Model/Storage/ExternalResource.php b/src/Model/Storage/ExternalResource.php
index 5c78e6d546..0e758c7062 100644
--- a/src/Model/Storage/ExternalResource.php
+++ b/src/Model/Storage/ExternalResource.php
@@ -58,7 +58,7 @@ class ExternalResource implements IStorage
 			return "";
 		}
 
-		$fetchResult = HTTPSignature::fetchRaw($data->url, $data->uid);
+		$fetchResult = HTTPSignature::fetchRaw($data->url, $data->uid, ['accept_content' => '']);
 		if ($fetchResult->isSuccess()) {
 			return $fetchResult->getBody();
 		} else {
diff --git a/src/Module/Proxy.php b/src/Module/Proxy.php
index b1683e8f5b..04fe00db12 100644
--- a/src/Module/Proxy.php
+++ b/src/Module/Proxy.php
@@ -75,7 +75,7 @@ class Proxy extends BaseModule
 		$request['url'] = str_replace(' ', '+', $request['url']);
 
 		// Fetch the content with the local user
-		$fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), ['timeout' => 10]);
+		$fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), ['accept_content' => '', 'timeout' => 10]);
 		$img_str = $fetchResult->getBody();
 
 		if (!$fetchResult->isSuccess() || empty($img_str)) {