diff --git a/src/Event/Http/HttpRequestEvent.php b/src/Event/Http/HttpRequestEvent.php
index 89e1c2552..ce59eff7f 100644
--- a/src/Event/Http/HttpRequestEvent.php
+++ b/src/Event/Http/HttpRequestEvent.php
@@ -101,13 +101,13 @@ public function getRemotePort(): int
      */
     public function getBasicAuthCredentials(): array
     {
-        $authorizationHeader = trim($this->headers['authorization'][0] ?? '');
+        $authorizationHeader = trim($this->headers['authorization'][0] ?? '', " \t");
 
         if (! str_starts_with($authorizationHeader, 'Basic ')) {
             return [null, null];
         }
 
-        $auth = base64_decode(trim(explode(' ', $authorizationHeader)[1]), true);
+        $auth = base64_decode(trim(explode(' ', $authorizationHeader)[1], " \t"), true);
 
         if ($auth === false || ! str_contains($auth, ':')) {
             return [null, null];
@@ -186,7 +186,7 @@ public function getCookies(): array
             // Multiple "Cookie" headers are not authorized
             // https://stackoverflow.com/questions/16305814/are-multiple-cookie-headers-allowed-in-an-http-request
             $cookieHeader = $this->headers['cookie'][0];
-            $cookieParts = array_map('trim', explode(';', $cookieHeader));
+            $cookieParts = array_map(fn (string $part) => trim($part, " \t"), explode(';', $cookieHeader));
         }
 
         $cookies = [];
diff --git a/src/Runtime/LambdaRuntime.php b/src/Runtime/LambdaRuntime.php
index a5e5d88ae..4243cac41 100755
--- a/src/Runtime/LambdaRuntime.php
+++ b/src/Runtime/LambdaRuntime.php
@@ -149,7 +149,7 @@ private function waitNextInvocation(): array
             }
             [$name, $value] = preg_split('/:\s*/', $header, 2);
             $name = strtolower($name);
-            $value = trim($value);
+            $value = trim($value, " \t\r\n");
             if ($name === 'lambda-runtime-aws-request-id') {
                 $contextBuilder->setAwsRequestId($value);
             }
diff --git a/tests/Event/Http/HttpRequestEventTest.php b/tests/Event/Http/HttpRequestEventTest.php
index 12b478d51..140cbc966 100644
--- a/tests/Event/Http/HttpRequestEventTest.php
+++ b/tests/Event/Http/HttpRequestEventTest.php
@@ -170,6 +170,18 @@ public function test basic auth with an empty password()
         $this->assertSame(['user', ''], $event->getBasicAuthCredentials());
     }
 
+    public function test basic auth with whitespace around the header value()
+    {
+        $event = new HttpRequestEvent([
+            'httpMethod' => 'GET',
+            'headers' => [
+                'Authorization' => "\t Basic " . base64_encode('user:password') . " \t",
+            ],
+        ]);
+
+        $this->assertSame(['user', 'password'], $event->getBasicAuthCredentials());
+    }
+
     public function test basic auth without a colon is rejected()
     {
         $event = new HttpRequestEvent([
@@ -204,6 +216,18 @@ public function test cookies without a space after the semicolon()
         $this->assertSame(['a' => '1', 'b' => '2', 'c' => '3'], $event->getCookies());
     }
 
+    public function test cookies with whitespace around the pairs()
+    {
+        $event = new HttpRequestEvent([
+            'httpMethod' => 'GET',
+            'headers' => [
+                'Cookie' => "a=1 ;\tb=2\t; c=3",
+            ],
+        ]);
+
+        $this->assertSame(['a' => '1', 'b' => '2', 'c' => '3'], $event->getCookies());
+    }
+
     /**
      * @dataProvider provide query strings
      */
diff --git a/tests/Sam/PhpRuntimeTest.php b/tests/Sam/PhpRuntimeTest.php
index bbd379463..9bfcee9af 100644
--- a/tests/Sam/PhpRuntimeTest.php
+++ b/tests/Sam/PhpRuntimeTest.php
@@ -258,7 +258,7 @@ private function invokeLambda($event = null): array
         $stderr = preg_replace('/\x1b\[[0-9;]*m/', '', $stderr);
 
         // Extract the result from stdout
-        $output = explode("\n", trim($process->getOutput()));
+        $output = explode("\n", trim($process->getOutput(), " \t\n\r\0\x0B"));
         $lastLine = end($output);
         if (! empty($lastLine)) {
             $result = json_decode($lastLine, true, 512, JSON_THROW_ON_ERROR);
@@ -269,7 +269,7 @@ private function invokeLambda($event = null): array
             $result = null;
             // Was there an error?
             preg_match('/REPORT RequestId: [^\n]*(.*)/s', $stderr, $matches);
-            $error = trim($matches[1] ?? '');
+            $error = trim($matches[1] ?? '', " \t\n\r\0\x0B");
             if ($error !== '') {
                 $result = json_decode($error, true, 512, JSON_THROW_ON_ERROR);
                 if (json_last_error()) {
@@ -314,7 +314,7 @@ private function assertErrorInLogs(
         // Extract the only interesting log line
         $logLines = explode("\n", $logs);
         $logLines = array_filter($logLines, function (string $line): bool {
-            $line = trim($line);
+            $line = trim($line, " \t\n\r\0\x0B");
             return $line !== ''
                 && (strpos($line, 'START') !== 0)
                 && (strpos($line, 'END') !== 0)