This line informs the proxy server to set the host name on the proxy request to that of the proxy server.
这一行通知代理服务器将代理请求上的主机名设置为代理服务器上的主机名。
2
Remember, in other API calls, using GET, all the parameters can and do appear as query parameters on the URL line; using POST, they appear in the body of the HTTP request.
记住，在其他 API 调用中，若使用 GET，则所有参数可以作为查询参数出现在 URL 行；若使用 POST，则参数出现在 HTTP 请求的主体中。
3
By contrast, when customers request their orders (for viewing online, perhaps), they might want to see more information, for example, the human-readable name for a part on a line item.