我们想使用 HTTP 请求检查股票的历史数据，并获取 JSON。
使用yahoo API，我发现不仅很难清楚地理解HTTP请求字段，而且很难获取某一天的数据（不是每一天的平均值，而是某一天的值），用这个:
http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20%3D%20%22AAPL%22%20and%20startDate%20%3D%20%222012-09-11%22%20and%20endDate%20%3D%20%222014-02-11%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=没有任何地方解释如何设置每个字段（也没有在雅虎控制台）。
您无法设置某一天并获取其值。
除了现在免费的雅虎之外，还有其他稳定的解决方案吗？或者，我怎样才能理解请求中所有这些垃圾标志的含义？
<URL> 本身包含数据选择标签：
http://query.yahooapis.com/v1/public/yql?q=
select * from yahoo.finance.historicaldata
where symbol = "AAPL"
and startDate = "2012-09-11"
and endDate = "2014-02-11"
&format=json
&diagnostics=true
&env=store://datatables.org/alltableswithkeys
&callback=
因此，要获取“AAPL”上 2014-08-10 .. 2014-08-12 之间的最后几天（一对，请注意结果中 endDate 的解释）：
"results":{
"quote":[
{
"Symbol":"AAPL",
"Date":"2014-08-12",
"Open":"96.04",
"High":"96.88",
"Low":"95.61",
"Close":"95.97",
"Volume":"33795000",
"Adj_Close":"95.97"
},
{
"Symbol":"AAPL",
"Date":"2014-08-11",
"Open":"95.27",
"High":"96.08",
"Low":"94.84",
"Close":"95.99",
"Volume":"36585000",
"Adj_Close":"95.99"
}
]
}
（完整的 Y！回复记录）
{
"query":{
"count":2,
"created":"2014-08-14T21:32:41Z",
"lang":"en-EN",
"diagnostics":{
"url":[
{
"execution-start-time":"0",
"execution-stop-time":"1",
"execution-time":"1",
"content":"http://www.datatables.org/yahoo/finance/yahoo.finance.historicaldata.xml"
},
{
"execution-start-time":"5",
"execution-stop-time":"16",
"execution-time":"11",
"content":"http://ichart.finance.yahoo.com/table.csv?g=d&f=2014&e=12&c=2014&b=10&a=7&d=7&s=AAPL"
},
{
"execution-start-time":"18",
"execution-stop-time":"28",
"execution-time":"10",
"content":"http://ichart.finance.yahoo.com/table.csv?g=d&f=2014&e=12&c=2014&b=10&a=7&d=7&s=AAPL"
}
],
"publiclyCallable":"true",
"cache":[
{
"execution-start-time":"4",
"execution-stop-time":"4",
"execution-time":"0",
"method":"GET",
"type":"MEMCACHED",
"content":"91a0664b4e7cf29d40cce123239fec85"
},
{
"execution-start-time":"17",
"execution-stop-time":"18",
"execution-time":"1",
"method":"GET",
"type":"MEMCACHED",
"content":"31dd9633be8581af77baa442f314c921"
}
],
"query":[
{
"execution-start-time":"5",
"execution-stop-time":"17",
"execution-time":"12",
"params":"{url=[http://ichart.finance.yahoo.com/table.csv?g=d&f=2014&e=12&c=2014&b=10&a=7&d=7&s=AAPL]}",
"content":"select * from csv(0,1) where url=@url"
},
{
"execution-start-time":"18",
"execution-stop-time":"28",
"execution-time":"10",
"params":"{columnsNames=[Date,Open,High,Low,Close,Volume,Adj_Close], url=[http://ichart.finance.yahoo.com/table.csv?g=d&f=2014&e=12&c=2014&b=10&a=7&d=7&s=AAPL]}",
"content":"select * from csv(2,0) where url=@url and columns=@columnsNames"
}
],
"javascript":{
"execution-start-time":"3",
"execution-stop-time":"29",
"execution-time":"25",
"instructions-used":"34359",
"table-name":"yahoo.finance.historicaldata"
},
"user-time":"31",
"service-time":"23",
"build-version":"0.2.2666"
},
"results":{
"quote":[
{
"Symbol":"AAPL",
"Date":"2014-08-12",
"Open":"96.04",
"High":"96.88",
"Low":"95.61",
"Close":"95.97",
"Volume":"33795000",
"Adj_Close":"95.97"
},
{
"Symbol":"AAPL",
"Date":"2014-08-11",
"Open":"95.27",
"High":"96.08",
"Low":"94.84",
"Close":"95.99",
"Volume":"36585000",
"Adj_Close":"95.99"
}
]
}
}
}
人们可能会发现，成熟的查询处理重新包装了来自以下来源和后处理的数据源请求：
http://ichart.finance.yahoo.com/table.csv?g=d&f=2014&e=12&c=2014&b=10&a=7&d=7&s=AAPL产量：
Date,Open,High,Low,Close,Volume,Adj Close
2014-08-12,96.04,96.88,95.61,95.97,33795000,95.97
2014-08-11,95.27,96.08,94.84,95.99,36585000,95.99
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