C# MVC4 WebApi在响应头中添加ETag
我们在Mvc4中创建了一个REST服务 我试图在WebApi方法的响应中添加ETag头。它被添加到Header集合中,没有任何错误,但是当我在Fiddler中检查响应头时,它不在那里 下面是我用来在响应中写入头的方法:C# MVC4 WebApi在响应头中添加ETag,c#,.net,asp.net-mvc-4,response,etag,C#,.net,Asp.net Mvc 4,Response,Etag,我们在Mvc4中创建了一个REST服务 我试图在WebApi方法的响应中添加ETag头。它被添加到Header集合中,没有任何错误,但是当我在Fiddler中检查响应头时,它不在那里 下面是我用来在响应中写入头的方法: internal static HttpResponseMessage<T> GetResponse<T>(Tuple<T, Dictionary<string, string>> response) {
internal static HttpResponseMessage<T> GetResponse<T>(Tuple<T, Dictionary<string, string>> response)
{
HttpResponseMessage<T> httpResponse = new HttpResponseMessage<T>(response.Item1, HttpStatusCode.OK);
if (response.Item2 != null)
{
foreach (var responseHeader in response.Item2)
{
if (string.Compare(responseHeader.Key, "ETAG", StringComparison.OrdinalIgnoreCase) == 0)
{
httpResponse.Headers.ETag = new System.Net.Http.Headers.EntityTagHeaderValue("\"" + responseHeader.Value + "\"");
}
else
{
httpResponse.Headers.Add(responseHeader.Key, responseHeader.Value);
}
}
}
return httpResponse;
}
您可以通过两种方式完成,您可以在ActionFilter.OnActionExecuted方法中设置ETag,如下所示:
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) {
actionExecutedContext.ActionContext.Response.Headers.ETag = new EntityTagHeaderValue(...);
}
但是,无法轻松地将所需的值从控制器传递到ActionFilter。第二种方法是更改WebAPI操作。返回HttpResponseMessage,而不是返回模型类型:
[HttpGet]
public HttpResponseMessage MyActionMethod() {
var result = // response data
var response = Request.CreateResponse<MyType>(HttpStatusCode.OK, result);
response.Headers.Add("Last Modified", result.Modified.ToString("R"));
response.Headers.ETag = new System.Net.Http.Headers.EntityTagHeaderValue(CreateEtag(result));
return response;
}
您可以通过两种方式完成,您可以在ActionFilter.OnActionExecuted方法中设置ETag,如下所示:
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) {
actionExecutedContext.ActionContext.Response.Headers.ETag = new EntityTagHeaderValue(...);
}
但是,无法轻松地将所需的值从控制器传递到ActionFilter。第二种方法是更改WebAPI操作。返回HttpResponseMessage,而不是返回模型类型:
[HttpGet]
public HttpResponseMessage MyActionMethod() {
var result = // response data
var response = Request.CreateResponse<MyType>(HttpStatusCode.OK, result);
response.Headers.Add("Last Modified", result.Modified.ToString("R"));
response.Headers.ETag = new System.Net.Http.Headers.EntityTagHeaderValue(CreateEtag(result));
return response;
}
如果我添加任何其他自定义标题,例如ClientId:1234,则返回该标题,但不返回ETag和日期标题。如果我添加任何其他自定义标题,例如ClientId:1234,则返回该标题,但不返回ETag和日期标题。