refactor: Remove superflous header (#127)

Author: OskarStark

src/Platform/Anthropic.php

@@ -30,7 +30,6 @@ public function request(array $body): iterable
         $response = $this->httpClient->request('POST', 'https://api.anthropic.com/v1/messages', [
             'headers' => [
                 'x-api-key' => $this->apiKey,
-                'Content-Type' => 'application/json',
                 'anthropic-version' => '2023-06-01',
             ],
             'json' => $body,

src/Platform/OpenAI/Azure.php

@@ -29,7 +29,6 @@ protected function rawRequest(string $endpoint, array $body): ResponseInterface
         return $this->httpClient->request('POST', $url, [
             'headers' => [
                 'api-key' => $this->apiKey,
-                'Content-Type' => 'application/json',
             ],
             'query' => ['api-version' => $this->apiVersion],
             'json' => $body,

src/Platform/OpenAI/OpenAI.php

@@ -25,8 +25,7 @@ protected function rawRequest(string $endpoint, array $body): ResponseInterface
 
         return $this->httpClient->request('POST', $url, [
             'auth_bearer' => $this->apiKey,
-            'headers' => ['Content-Type' => 'application/json'],
-            'body' => json_encode($body),
+            'json' => $body,
         ]);
     }
 }

src/Platform/Voyage.php

@@ -22,7 +22,6 @@ public function __construct(
     public function request(array $body): array
     {
         $response = $this->httpClient->request('POST', 'https://api.voyageai.com/v1/embeddings', [
-            'headers' => ['Content-Type' => 'application/json'],
             'auth_bearer' => $this->apiKey,
             'json' => $body,
         ]);

src/Store/Azure/SearchStore.php

@@ -54,7 +54,6 @@ private function request(string $endpoint, array $payload): array
         $response = $this->httpClient->request('POST', $url, [
             'headers' => [
                 'api-key' => $this->apiKey,
-                'Content-Type' => 'application/json',
             ],
             'query' => ['api-version' => $this->apiVersion],
             'json' => $payload,