这个问题与优素福的出色回答有关。我喜欢OnSendingHeaders
回调。我现在可以添加响应标头而不必担心切换流。无论如何,这是我的问题。是否可以像这样读取回调内的响应正文。
public override async Task Invoke(OwinRequest request, OwinResponse response)
{
request.OnSendingHeaders(state =>
{
var resp = (OwinResponse)state;
// Here, I want to convert resp, which is OwinResponse
// to HttpResponseMessage so that when Content.ReadAsStringAsync
// is called off this HttpResponseMessage object, I want the
// response body as string.
var responseMessage = new HttpResponseMessage();
responseMessage.Content = new StreamContent(resp.Body);
// Here I would like to call
// responseMessage.Content.ReadAsStringAsync()
}, response);
await Next.Invoke(request, response);
}
我想从回调中调用的方法是依赖于HttpResponseMessage
并且不想更改它们的类的一部分。
如果我在管道处理开始之前将响应主体设置为内存流(正如 Youssef 在链接答案中最初建议的那样),我可以让它工作。有没有更好的方法在回调中做到这一点而不是那个?
编辑:
这个可以吗?
public override async Task Invoke(OwinRequest request, OwinResponse response)
{
// Do something with request
Stream originalStream = response.Body;
var buffer = new MemoryStream();
response.Body = buffer;
await Next.Invoke(request, response);
var responseMessage = new HttpResponseMessage();
response.Body.Seek(0, SeekOrigin.Begin);
responseMessage.Content = new StreamContent(response.Body);
// Pass responseMessage to other classes for the
// response body to be read like this
// responseMessage.Content.ReadAsStringAsyn()
// Add more response headers
if (buffer != null && buffer.Length > 0)
{
buffer.Seek(0, SeekOrigin.Begin);
await buffer.CopyToAsync(originalStream);
}
}