具有更改Mashery "sig=XXXXXX“查询项的NSURLCache

Question

当URL包含更改的查询项时，是否可以使用NSURLCache缓存响应？例如，我们添加了Mashery所需的"sig=XXXXXX“查询项，该查询项随每个请求而变化。

如果没有，是否有解决方法？

Answer 1

通过将NSURLCache子类化并覆盖其缓存方法来解决。

在每个被覆盖的方法中，我在调用超类的方法之前从请求中删除了查询项。

例如：

override func storeCachedResponse(cachedResponse: NSCachedURLResponse, forRequest request: NSURLRequest) {
        let strippedRequest = removeQueryItemFromRequest(self.queryItemName, request: request)

        if let url = strippedRequest.URL {
            let response = NSURLResponse(URL: url, MIMEType: cachedResponse.response.MIMEType, expectedContentLength: Int(cachedResponse.response.expectedContentLength), textEncodingName: cachedResponse.response.textEncodingName)
            let newCachedResponse = NSCachedURLResponse(response: response, data: cachedResponse.data)

            super.storeCachedResponse(newCachedResponse, forRequest: strippedRequest)
        }
        else {
            super.storeCachedResponse(cachedResponse, forRequest: request)
        }
    }

self.queryItemName是传递给自定义初始值设定项的存储属性。