标题和标头是字符串字段；散文是文本字段；时间截是日期和时间字段。
The title and slug are string fields; prose is a text field; and the timestamps are date and time fields.
接下来，该代码将使用Groovy字符串操作解析accept标头。
Next, the code parses the Accept header using the Groovy string manipulation.
标头的键应为字符串，在不区分大小写的基础上进行比较。
Keys to the headers are required to be strings, and comparisons are done on a case-insensitive basis.
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