After compressing, the filter replaces the incoming symbol in the request with the compressed version.
压缩完成后，这个过滤器用已压缩版本代替请求中传入的符号。
Next, the handler creates a header that indicates how the symbol was compressed and puts that header into the overall request context.
接下来，该处理程序创建一个头(它指出该符号是怎样被压缩的)并将这个头放入整体请求上下文中。
Next, the filter creates a context that indicates how the symbol was compressed and puts that context information into the overall request context.
接下来，该过滤器创建一个上下文(它指出该符号是如何压缩的)并将这些上下文信息放入整体请求上下文中。
The handler puts the compressed version of the symbol into the request, replacing the original symbol.
这个处理程序将该符号的已压缩版本放入请求中，替换原有的符号。
The filter then decompresses the symbol according to the compression type and replaces the compressed symbol in the request with the decompressed symbol.
然后，这个过滤器根据压缩类型对符号进行解压缩，并用解压缩后的符号替换请求中的已压缩符号。
The CompressFilter first gets the symbol from the incoming request.
CompressFilter首先从传入的请求获取符号。
Similar to a synchronous invocation, InvalidSymbolException indicates that the request has reached the service provider, which has thrown a business exception stating that the symbol is invalid.
与同步调用类似，InvalidSymbolException指示请求已到达服务提供程序，该提供程序抛出业务异常，指示符号无效。
Symbol, in this case, is a request parameter representing the requested ticker symbol, and callback is the name of your callback function in your Web application.
在这种情况下，symbol是表示请求ticker symbol的请求参数，而callback是Web应用程序的回调函数的名称。
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。
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。
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