[英]Redirect to URL with POST method in Asp.Net Core
我有簡單的 url 重寫器:
private static void RedirectToAPI(RewriteContext context)
{
var request = context.HttpContext.Request;
if (request.Path.Value.StartsWith("/apiendpoint", StringComparison.OrdinalIgnoreCase))
{
var json = JsonConvert.SerializeObject(request.Path.Value
.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries)
.Skip(1));
var response = context.HttpContext.Response;
response.Headers[HeaderNames.Location] = $"/custom";
response.StatusCode = StatusCodes.Status301MovedPermanently;
context.Result = RuleResult.EndResponse;
using (var bodyWriter = new StreamWriter(response.Body))
{
bodyWriter.Write(json);
bodyWriter.Flush();
}
}
}
問題是,當它重定向到/custom url 時,請求有方法 GET,而這個方法需要 POST。
例如,發送GET請求到url /apiendpoint/first/second/third ,然后rewriter響應redirect,相應地,下面的請求必須是POST方法,但現在是GET。
如何更改請求方法,即在 url 重寫器響應之后?
這是一個示例代碼
public class ConvertGetToPostHandler : DelegatingHandler
{
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
// Add your logic here to decide if the request Method needs to be changed
// Caution: This works only if you're redirecting internally
request.Method = HttpMethod.Post;
return await base.SendAsync(request, cancellationToken);
}
}
您必須將處理程序添加到處理程序管道中
config.MessageHandlers.Add(new ConvertGetToPostHandler());
此外,請通讀此文檔以深入了解其目的和用法。
你能把@juunas 的答案設置為正確答案嗎,正如你在我的示例代碼中看到的那樣,他的答案為我解決了這個問題。
internal class RedirectCultureRule : IRule
{
private const string CultureKey = "culture";
public void ApplyRule(RewriteContext context)
{
HttpRequest httpRequest = context.HttpContext.Request;
httpRequest.Query.TryGetValue(CultureKey, out StringValues cultureValues);
string culture = cultureValues;
if (cultureValues.Count > 0 && culture.IsCultureMatch())
{
context.Result = RuleResult.ContinueRules;
return;
}
Dictionary<string, string> queryParts = new Dictionary<string, string>();
NameValueCollection queryString = HttpUtility.ParseQueryString(httpRequest.QueryString.ToString());
foreach (string key in queryString)
{
queryParts[key.Trim()] = queryString[key].Trim();
}
if (!queryParts.ContainsKey(CultureKey))
{
queryParts[CultureKey] = CultureInfo.CurrentCulture.Name;
}
string query = $"?{string.Join("&", queryParts.Select(qp => $"{qp.Key}={qp.Value}"))}";
if (query.Length > 1)
{
httpRequest.QueryString = new QueryString(query);
}
string url = UriHelper.GetDisplayUrl(httpRequest);
HttpResponse httpResponse = context.HttpContext.Response;
httpResponse.StatusCode = 308;
httpResponse.Headers[HeaderNames.Location] = url;
using (StreamReader requestReader = new StreamReader(httpRequest.Body))
{
using (StreamWriter responseWriter = new StreamWriter(httpResponse.Body))
{
string body = requestReader.ReadToEnd();
responseWriter.Write(body);
responseWriter.Flush();
}
}
context.Result = RuleResult.EndResponse;
}
}
如果使用 ASP.NET Core 2.0,則有 RedirectPermanentPreserveMethod,您可以在此處閱讀。 如果不支持此方法,您可以嘗試手動執行。
編輯:啊,剛剛檢查了評論。 如果初始請求是 GET,那么這也不起作用,您不能告訴瀏覽器進行 POST。 不是沒有返回一個使用 JavaScript 自動執行表單的視圖。
您需要返回 308,而不是 301。
這是更改后的代碼:
private static void RedirectToAPI(RewriteContext context)
{
var request = context.HttpContext.Request;
if (request.Path.Value.StartsWith("/apiendpoint", StringComparison.OrdinalIgnoreCase))
{
var json = JsonConvert.SerializeObject(request.Path.Value
.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries)
.Skip(1));
var response = context.HttpContext.Response;
response.Headers[HeaderNames.Location] = $"/custom";
response.StatusCode = 308;
context.Result = RuleResult.EndResponse;
using (var bodyWriter = new StreamWriter(response.Body))
{
bodyWriter.Write(json);
bodyWriter.Flush();
}
}
}
308 是永久重定向,需要瀏覽器保留該方法。 https://httpstatuses.com/308
臨時版本是 307。
這些重定向的便捷方法在 MVC Core 2.0.0-preview1 中可用。
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