Again using an expression, the symbol field in Card a is modified to use as its input the stock symbol sent as a query parameter in the HTTP request, as shown in Figure 11.
再次使用一个表达式将卡片a中的symbol字段修改为使用卡片e的输入(stock symbol，作为HTTP请求中的查询参数进行发送)，如图11中所示。
As shown in Listing 11, you can also use the curl command to download HTTP-hosted files.
如清单11所示，您也可以使用curl命令来下载http托管的文件。
In line (10), the global variable Http is populated, and line (11) builds up the arguments that are added to the URL.
在第(10)行，填充了全局变量http；第(11)行构建添加到URL中的参数。
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