Repository: getsentry/sentry-php (php)

Issue:
Error in RequestIntegration when HTTP header name is numeric
### How do you use Sentry?

Self-hosted/on-premise

### Version

3.2.0

### Steps to Reproduce

- Use latest `sentry-laravel` @ 2.13.0.
- Send a query that use a numeric HTTP header such as `curl -v -H "123: test" https://www.example.com`
- Notice an error in PHP error log (see below).

### Expected Result

No error is produced in PHP error log.

### Actual Result

From PHP error log:
```
PHP Fatal error:  Uncaught TypeError: strtolower(): Argument #1 ($string) must be of type string, int given in /data/site/vendor/sentry/sentry/src/Integration/RequestIntegration.php:179
Stack trace:
#0 /data/site/vendor/sentry/sentry/src/Integration/RequestIntegration.php(179): strtolower(1)
#1 /data/site/vendor/sentry/sentry/src/Integration/RequestIntegration.php(157): Sentry\Integration\RequestIntegration->sanitizeHeaders(Array)
#2 /data/site/vendor/sentry/sentry/src/Integration/RequestIntegration.php(115): Sentry\Integration\RequestIntegration->processEvent(Object(Sentry\Event), Object(Sentry\Options))
#3 /data/site/vendor/sentry/sentry/src/State/Scope.php(370): Sentry\Integration\RequestIntegration->Sentry\Integration\{closure}(Object(Sentry\Event), Object(Sentry\EventHint))
#4 /data/site/vendor/sentry/sentry/src/Client.php(264): Sentry\State\Scope->applyToEvent(Object(Sentry\Event), Object(Sentry\EventHint))
#5 /data/site/vendor/sentry/sentry/src/Client.php(147): Sentry\Client->prepareEvent(Object(Sentry\Event), Object(Sentry\EventHint), Object(Sentry\State\Scope))
#6 /data/site/vendor/sentry/sentry/src/Client.php(139): Sentry\Client->captureEvent(Object(Sentry\Event), Object(Sentry\EventHint), Object(Sentry\State\Scope))
#7 /data/site/vendor/sentry/sentry/src/State/Hub.php(138): Sentry\Client->captureException(Object(TypeError), Object(Sentry\State\Scope), Object(Sentry\EventHint))
#8 /data/site/app/Exceptions/Handler.php(151): Sentry\State\Hub->captureException(Object(TypeError))
#9 /data/site/app/Exceptions/Handler.php(87): App\Exceptions\Handler->reportWithSentry(Object(TypeError))
#10 /data/site/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(191): App\Exceptions\Handler->report(Object(TypeError))
#11 /data/site/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(259): Illuminate\Foundation\Bootstrap\HandleExceptions->handleException(Object(TypeError))
#12 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->Illuminate\Foundation\Bootstrap\{closure}(Object(TypeError))
#13 {main}
  thrown in /data/site/vendor/sentry/sentry/src/Integration/RequestIntegration.php on line 179
```

Pull request description:
fix: Do not throw an TypeError on numeric HTTP headers
Fixes #1369 

While I'm not entirely sure if numeric headers are in sync with the spec, we should definitely not throw an `TypeError` in this case.

Patch:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 657621c..81346ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- fix: Do not throw an TypeError on numeric HTTP headers (#1370)
+
 ## 3.8.0 (2022-09-05)
 
 - Add `Sentry\Monolog\BreadcrumbHandler`, a Monolog handler to allow registration of logs as breadcrumbs (#1199)
diff --git a/src/Integration/RequestIntegration.php b/src/Integration/RequestIntegration.php
index b3b5153..23ea88a 100644
--- a/src/Integration/RequestIntegration.php
+++ b/src/Integration/RequestIntegration.php
@@ -169,13 +169,16 @@ private function processEvent(Event $event, Options $options): void
     /**
      * Removes headers containing potential PII.
      *
-     * @param array<string, string[]> $headers Array containing request headers
+     * @param array<array-key, string[]> $headers Array containing request headers
      *
      * @return array<string, string[]>
      */
     private function sanitizeHeaders(array $headers): array
     {
         foreach ($headers as $name => $values) {
+            // Cast the header name into a string, to avoid errors on numeric headers
+            $name = (string) $name;
+
             if (!\in_array(strtolower($name), $this->options['pii_sanitize_headers'], true)) {
                 continue;
             }


Test patch:
diff --git a/tests/Integration/RequestIntegrationTest.php b/tests/Integration/RequestIntegrationTest.php
index f57a9b1..6e5e85b 100644
--- a/tests/Integration/RequestIntegrationTest.php
+++ b/tests/Integration/RequestIntegrationTest.php
@@ -422,6 +422,22 @@ public function invokeDataProvider(): iterable
             null,
             null,
         ];
+
+        yield [
+            [],
+            (new ServerRequest('GET', 'http://www.example.com/foo'))
+                ->withHeader('123', 'test'),
+            [
+                'url' => 'http://www.example.com/foo',
+                'method' => 'GET',
+                'headers' => [
+                    'Host' => ['www.example.com'],
+                    '123' => ['test'],
+                ],
+            ],
+            null,
+            null,
+        ];
     }
 
     private function createRequestFetcher(ServerRequestInterface $request): RequestFetcherInterface