Throw an exception if user sends 1xx response with body

Author: roxblnfk

src/HttpWorker.php

@@ -65,8 +65,12 @@ public function waitRequest(): ?Request
     /**
      * @throws \JsonException
      */
-    public function respond(int $status, string|Generator $body, array $headers = [], bool $endOfStream = true): void
+    public function respond(int $status, string|Generator $body = '', array $headers = [], bool $endOfStream = true): void
     {
+        if ($status < 200 && $status >= 100 && $body !== '') {
+            throw new \InvalidArgumentException('Unable to send a body with informational status code.');
+        }
+
         if ($body instanceof Generator) {
             $this->respondStream($status, $body, $headers, $endOfStream);
             return;

tests/Feature/StreamResponseTest.php

@@ -96,6 +96,21 @@ public function testStopStreamResponse(): void
         self::assertSame(\implode("\n", ['Hel', 'lo,']), \trim(ServerRunner::getBuffer()));
     }
 
+    public function testSend1xxWithBody(): void
+    {
+        $httpWorker = $this->makeHttpWorker();
+
+        $this->expectExceptionMessage('Unable to send a body with informational status code');
+
+        $httpWorker->respond(
+            103,
+            (function () {
+                yield 'Hel';
+                yield 'lo,';
+            })(),
+        );
+    }
+
     public function testExceptionInGenerator(): void
     {
         $httpWorker = $this->makeHttpWorker();