diff --git a/src/Composer/Downloader/FileDownloader.php b/src/Composer/Downloader/FileDownloader.php
index 3ca7eb9e4..a99ea79a0 100644
--- a/src/Composer/Downloader/FileDownloader.php
+++ b/src/Composer/Downloader/FileDownloader.php
@@ -16,6 +16,7 @@ use Composer\Config;
 use Composer\Cache;
 use Composer\IO\IOInterface;
 use Composer\IO\NullIO;
+use Composer\Exception\IrrecoverableDownloadException;
 use Composer\Package\Comparer\Comparer;
 use Composer\DependencyResolver\Operation\UpdateOperation;
 use Composer\DependencyResolver\Operation\InstallOperation;
@@ -219,6 +220,10 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
             }
             $self->clearLastCacheWrite($package);
 
+            if ($e instanceof IrrecoverableDownloadException) {
+                throw $e;
+            }
+
             if ($e instanceof TransportException) {
                 // if we got an http response with a proper code, then requesting again will probably not help, abort
                 if ((0 !== $e->getCode() && !in_array($e->getCode(), array(500, 502, 503, 504))) || !$retries) {
diff --git a/src/Composer/Util/HttpDownloader.php b/src/Composer/Util/HttpDownloader.php
index 757e5f3c6..ba7a49798 100644
--- a/src/Composer/Util/HttpDownloader.php
+++ b/src/Composer/Util/HttpDownloader.php
@@ -19,6 +19,7 @@ use Composer\Util\Http\Response;
 use Composer\Composer;
 use Composer\Package\Version\VersionParser;
 use Composer\Semver\Constraint\Constraint;
+use Composer\Exception\IrrecoverableDownloadException;
 use React\Promise\Promise;
 
 /**
@@ -257,10 +258,11 @@ class HttpDownloader
             if (isset($job['curl_id'])) {
                 $curl->abortRequest($job['curl_id']);
             }
+            throw new IrrecoverableDownloadException('Download of ' . Url::sanitize($job['request']['url']) . ' canceled');
         };
 
         $promise = new Promise($resolver, $canceler);
-        $promise->then(function ($response) use (&$job, $downloader) {
+        $promise = $promise->then(function ($response) use (&$job, $downloader) {
             $job['status'] = HttpDownloader::STATUS_COMPLETED;
             $job['response'] = $response;
 
@@ -306,7 +308,7 @@ class HttpDownloader
             if (isset($job['request']['options']['http']['header']) && false !== stripos(implode('', $job['request']['options']['http']['header']), 'if-modified-since')) {
                 $resolve(new Response(array('url' => $url), 304, array(), ''));
             } else {
-                $e = new TransportException('Network disabled, request canceled: '.$url, 499);
+                $e = new TransportException('Network disabled, request canceled: '.Url::sanitize($url), 499);
                 $e->setStatusCode(499);
                 $reject($e);
             }
@@ -429,7 +431,7 @@ class HttpDownloader
                 }
             }
 
-            $io->writeError('<'.$type.'>'.ucfirst($type).' from '.$url.': '.$data[$type].'</'.$type.'>');
+            $io->writeError('<'.$type.'>'.ucfirst($type).' from '.Url::sanitize($url).': '.$data[$type].'</'.$type.'>');
         }
     }
 
diff --git a/src/Composer/Util/ProcessExecutor.php b/src/Composer/Util/ProcessExecutor.php
index f940f49a9..f2f286916 100644
--- a/src/Composer/Util/ProcessExecutor.php
+++ b/src/Composer/Util/ProcessExecutor.php
@@ -177,6 +177,8 @@ class ProcessExecutor
                 // signal can throw in various conditions, but we don't care if it fails
             }
             $job['process']->stop(1);
+
+            throw new \RuntimeException('Aborted process');
         };
 
         $promise = new Promise($resolver, $canceler);