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# 使用来自 AWS SDK for Ruby 客户端的线迹信息进行调试
<a name="debugging"></a>

通过设置`http_wire_trace`布尔值，您可以从 AWS 客户端获取电线追踪信息。线路跟踪信息有助于区分客户端更改、服务问题和用户错误。当值为 `true` 时，该设置会显示线路上当前发送的内容。以下示例创建了 Amazon S3 客户端，该客户端在创建时启用了线路跟踪。

```
s3 = Aws::S3::Client.new(http_wire_trace: true)
```

鉴于以下代码和参数 `bucket_name`，输出会显示一条消息来表明是否存在该名称的存储桶。

```
require 'aws-sdk-s3'

s3 = Aws::S3::Resource.new(client: Aws::S3::Client.new(http_wire_trace: true))

if s3.bucket(ARGV[0]).exists?
  puts "Bucket #{ARGV[0]} exists"
else
  puts "Bucket #{ARGV[0]} does not exist"
end
```

如果存在存储桶，则输出类似于以下内容。(为便于阅读，向 `HEAD` 行添加了回车。)

```
opening connection to bucket_name.s3-us-west-1.amazonaws.com:443...
opened
starting SSL for bucket_name.s3-us-west-1.amazonaws.com:443...
SSL established, protocol: TLSv1.2, cipher: ECDHE-RSA-AES128-GCM-SHA256
-> "HEAD / HTTP/1.1
    Accept-Encoding: 
    User-Agent: aws-sdk-ruby3/3.171.0 ruby/3.2.2 x86_64-linux aws-sdk-s3/1.120.0
    Host: bucket_name.s3-us-west-1.amazonaws.com
    X-Amz-Date: 20230427T143146Z
/* omitted */
Accept: */*\r\n\r\n"
-> "HTTP/1.1 200 OK\r\n"
-> "x-amz-id-2: XxB2J+kpHgTjmMUwpkUI1EjaFSPxAjWRgkn/+z7YwWc/iAX5E3OXRBzJ37cfc8T4D7ELC1KFELM=\r\n"
-> "x-amz-request-id: 5MD4APQQS815QVBR\r\n"
-> "Date: Thu, 27 Apr 2023 14:31:47 GMT\r\n"
-> "x-amz-bucket-region: us-east-1\r\n"
-> "x-amz-access-point-alias: false\r\n"
-> "Content-Type: application/xml\r\n"
-> "Server: AmazonS3\r\n"
-> "\r\n"
Conn keep-alive
Bucket bucket_name exists
```

您也可以在创建客户端后开启线路跟踪。

```
s3 = Aws::S3::Client.new
s3.config.http_wire_trace = true
```

有关所报告线路跟踪信息中各个字段的更多信息，请参阅 [Transfer Family 必填请求标头](https://docs.aws.amazon.com/transfer/latest/userguide/making-api-requests.html#request-headers)。