Amazon Lex postContent错误“解码会话属性失败”。

Question

我试图将我的网页连接到我的Lex机器人使用来自AWS SDK for PHP的postContent。

$credentials = new \Aws\Credentials\Credentials('XXXXXXXX', 'XXXXXXXXXXXXXXXXXXXXXXXXXX');

$args = array(
    'region' => 'us-east-1',
    'version' => 'latest',
    'debug' => true,
    'credentials' => $credentials
);

$lex_client = new Aws\LexRuntimeService\LexRuntimeServiceClient($args);

$lex_response = $lex_client->postContent([
    'accept' => 'text/plain; charset=utf-8',
    'botAlias' => 'XXXX',
    'botName' => 'XXXX',
    'contentType' => 'text/plain; charset=utf-8',
    'inputStream' => $userInput,
    'requestAttributes' => "{}",
    'sessionAttributes' => "{}",
    'userId' => 'XXXXXXXXXXXX',
]);

‘在“https://runtime.lex.us-east-1.amazonaws.com/bot/xxxx/alias/xxx/user/xxxxxxxx/content”上执行“postContent”时出错；

AWS HTTP错误：客户端错误:post https://runtime.lex.us-east-1.amazonaws.com/bot/xxxx/alias/xxxx/user/xxxxxxx/content导致400错误请求响应：{“消息”：“无效请求：未能解码会话属性。会话属性应该是Base64编码的字符串到字符串的json映射”}‘（长度=142)

我尝试在sessionAttributes中使用各种JSON字符串、JSON编码的字符串和Base64编码的字符串，但仍然出现同样的错误。

Answer 1

AWS SDK中的LexRuntimeService自动对postContent数组进行JSON编码和Base64编码。通过传递一个JSON字符串，SDK中的JSON编码将在{}周围加上双引号，使其成为“{}”，从而导致错误。

因此，只需将SessionAttributes和RequestAttributes作为PHP数组传递即可。

$lex_response = $lex_client->postContent([
    'accept' => 'text/plain; charset=utf-8',
    'botAlias' => 'XXXX',
    'botName' => 'XXXX',
    'contentType' => 'text/plain; charset=utf-8',
    'inputStream' => $userInput,
    'requestAttributes' => array(),
    'sessionAttributes' => array(),            // <---- PHP Array not JSON
    'userId' => 'XXXXXXXXXXXX',
]);