[英]Etag is not present in web api response header
在Web API響應中,我試圖在Web api的動作中設置Etag Header。 但它不在響應頭中。
我無法使用ActionFilter屬性設置ETag。 我必須采取行動。
[CacheControl(MaxAge = 5)]
public HttpResponseMessage GetStreamByPath(int presId)
{
HttpResponseMessage response = new HttpResponseMessage();
// Some Code here
//testStream is obj.
if (testStream != null)
{
var getEatg = ETagHelper.GetETag(testStream.LastModifiedDate.ToString());
if (Request.Headers.Contains("If-None-Match") && Request.Headers.GetValues("If-None-Match").ToString() == getEatg)
{
return Request.CreateResponse(HttpStatusCode.NotModified);
}
response.Headers.ETag = new EntityTagHeaderValue(String.Format("\"{0}\"", getEatg));
response = new HttpResponseMessage(HttpStatusCode.OK) { Content = new StreamContent(testStream.Stream) };
response.Content.Headers.Add("content-type", " image/jpeg");
}
else
{
response = new HttpResponseMessage(HttpStatusCode.Unauthorized);
}
return response;
}
您可以如下設置標題:
HttpContext.Current.Response.Headers.Add("ETag", String.Format("\"{0}\"", getEatg));
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