xml - 来自 weather.gov 的当前观察提要被禁止 (403)

Question

对于来自 HTTPClient 的所有请求，Weather.gov Current Observation 提要突然开始失败，同样我观察到互联网上许多使用 AJAX 调用 weather.gov 的网站也失败了。

所有调用 weather.gov 当前观测提要的结果，例如http://w1.weather.gov/xml/current_obs/TAPA.xml ，返回 403。所述 URL 在浏览器中正确解析。

Answer 1

联系 weather.gov 得到了非常快速的响应，即:

Applications accessing resources on weather.gov now need to provide a User-Agent header in any HTTP request. Requests without a user agent are automatically blocked. We have implemented this usage policy due to a small number of clients utilizing resources far in excess of what most would consider reasonable.

We recommend providing a user agent string in the following format:

ApplicationName/vX.Y (http://your.app.url/; contact.email@example.com)

This will both uniquely identify your application and allow us to contact you and work with you if we observe abnormal application behavior that may result in a block.

Please feel free to email us back if you continue to have issues after verifying that your application is sending the proper headers.

Thanks for using weather.gov.

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这是一段 C# 代码。关键是您需要创建请求对象，然后在调用之前向其附加自定义用户代理字符串。

...
var request = new HttpRequestMessage(HttpMethod.Post, httpClient.BaseAddress.AbsoluteUri);
request.Headers.Add("User-Agent", "MyApplication/v1.0 (http://foo.bar.baz; foo@bar.baz)");
var httpResponse = httpClient.SendAsync(request).Result;
...

希望对大家有所帮助。干杯