Do not generate body when not needed (#291)

Author: jderusse

src/Input/ListLayerVersionsRequest.php

@@ -81,11 +81,6 @@ public function getMaxItems(): ?int
         return $this->MaxItems;
     }
 
-    public function requestBody(): string
-    {
-        return '{}';
-    }
-
     public function requestHeaders(): array
     {
         $headers = ['content-type' => 'application/json'];

src/LambdaClient.php

@@ -99,7 +99,7 @@ public function listLayerVersions($input): ListLayerVersionsResponse
 
         $response = $this->getResponse(
             'GET',
-            $input->requestBody(),
+            null,
             $input->requestHeaders(),
             $this->getEndpoint($input->requestUri(), $input->requestQuery())
         );

tests/Unit/Input/ListLayerVersionsRequestTest.php

@@ -26,14 +26,6 @@ public function setUp(): void
         parent::setUp();
     }
 
-    public function testRequestBody(): void
-    {
-        $expected = '{
-        }';
-
-        self::assertJsonStringEqualsJsonString($expected, $this->input->requestBody());
-    }
-
     public function testInvalidEnum(): void
     {
         $input = new ListLayerVersionsRequest([