fix(lambda-http): into_api_gateway_v2_request joins cookies with "; " (#1143)

into_api_gateway_v2_request reconstructs the Cookie header by joining the cookies array from the API Gateway v2 event payload with ";" (no space). This violates RFC 6265 §4.2.1, which mandates "; " (semicolon followed by a space) as the cookie-pair separator. The result is a non-compliant Cookie header that breaks any downstream cookie parser that follows the spec strictly like BetterAuth.

Author: sbougerel

lambda-http/src/request.rs

@@ -147,7 +147,7 @@ fn into_api_gateway_v2_request(ag: ApiGatewayV2httpRequest) -> http::Request<Bod
 
     let mut headers = ag.headers;
     if let Some(cookies) = ag.cookies {
-        if let Ok(header_value) = HeaderValue::from_str(&cookies.join(";")) {
+        if let Ok(header_value) = HeaderValue::from_str(&cookies.join("; ")) {
             headers.insert(http::header::COOKIE, header_value);
         }
     }
@@ -570,7 +570,7 @@ mod tests {
 
         assert_eq!(req.method(), "POST");
         assert_eq!(req.uri(), "https://id.execute-api.us-east-1.amazonaws.com/my/path?parameter1=value1&parameter1=value2&parameter2=value");
-        assert_eq!(cookie_header, Ok("cookie1=value1;cookie2=value2"));
+        assert_eq!(cookie_header, Ok("cookie1=value1; cookie2=value2"));
 
         // Ensure this is an APIGWv2 request
         let req_context = req.request_context_ref().expect("Request is missing RequestContext");