chore(client): do not parse responses with empty content-length

Author: stainless-app[bot]

src/core.ts

@@ -70,6 +70,12 @@ async function defaultParseResponse<T>(props: APIResponseProps): Promise<T> {
   const mediaType = contentType?.split(';')[0]?.trim();
   const isJSON = mediaType?.includes('application/json') || mediaType?.endsWith('+json');
   if (isJSON) {
+    const contentLength = response.headers.get('content-length');
+    if (contentLength === '0') {
+      // if there is no content we can't do anything
+      return undefined as T;
+    }
+
     const json = await response.json();
 
     debug('response', response.status, response.url, response.headers, json);