Note: be aware that you might be required to sign up to receive an API key before using these services.
注意：要明白，在使用这些服务之前，您可能需要同意接收一个api键。
To test this on your own server, you need to replace your API key in Listing 5, which is shown in Figure 38.
要在您自己的服务器上测试它，需要替换清单5中的api键，如图38所示。
The key is free, but it's bound to a particular URL, so generating an API key for this article's application requires a bit of foresight.
该键是免费的，但它绑定到一个特定的URL，因此要为本文的应用程序生成一个api键需要提前做一点准备。
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