更新

server/tests/DifyChatStreamContractTest.php

@@ -95,6 +95,37 @@ $explicitOpenAi = callDifyStreamPrivate('buildRequestSpecs', [
 difyStreamExpect(count($explicitDify) === 1 && $explicitDify[0]['protocol'] === 'dify', 'explicit Dify endpoint never changes protocol');
 difyStreamExpect(count($explicitOpenAi) === 1 && $explicitOpenAi[0]['protocol'] === 'openai', 'explicit OpenAI endpoint never changes protocol');
 
+$retryableStream = [
+    'errno' => 0,
+    'http_code' => 200,
+    'emitted' => false,
+    'upstream_error' => true,
+    'finished' => false,
+];
+difyStreamExpect(
+    callDifyStreamPrivate('shouldTryNextProtocol', [$retryableStream, true]) === true,
+    'a terminal-free stream error before any delta tries the alternate protocol'
+);
+$retryableStream['emitted'] = true;
+difyStreamExpect(
+    callDifyStreamPrivate('shouldTryNextProtocol', [$retryableStream, true]) === false,
+    'an emitted delta forbids protocol retry'
+);
+difyStreamExpect(
+    callDifyStreamPrivate('shouldTryNextProtocol', [[
+        'errno' => 0,
+        'http_code' => 400,
+    ], false]) === true,
+    'an ambiguous endpoint rejected before generation tries the alternate protocol'
+);
+difyStreamExpect(
+    callDifyStreamPrivate('shouldTryNextProtocol', [[
+        'errno' => 0,
+        'http_code' => 401,
+    ], true]) === false,
+    'credential failures are not hidden by protocol retry'
+);
+
 $difyWire = ": ping\r\n\r\n"
     . "data: {\"event\":\"message\",\"answer\":\"你\",\"message_id\":\"msg-safe\"}\r\n\r\n"
     . "data: {\"event\":\"agent_message\",\"answer\":\"好\"}\r\n\r\n"