Question

我目前正在通过WebApi收到请求，并尝试将其重新发送到另一个网站。

目标是接收请求，例如：http://localhost:9999/#q=test。然后将其转发到真实网站:(对于我的测试，我设置了google.com）http://google.com/#q=test

我有以下代码：

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
    {
        string url = request.RequestUri.PathAndQuery;
        UriBuilder forwardUri = new UriBuilder(_otherWebSiteBase);
        forwardUri.Path = url;
        if (request.Method == HttpMethod.Get)
        {
            //request.Method = HttpMethod.Post;
        }
        request.RequestUri = forwardUri.Uri;
        request.Headers.Host = forwardUri.Host;
        return await _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);//_client is an HttpClient
    }

目前我有一个System.Net.ProtocolViolationException，其中说明： Cannot send a content-body with this verb-type.

但我的输入请求是GET请求（应该是GET请求）。如果我发出POST请求，我就不再有例外了，但Google表示他们不希望发出POST请求。

那么为什么会出现这种异常呢？有关如何修复的想法吗？

Answer 1

我最后创建了初始请求的副本，然后再次发送：

protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
{
    string url = request.RequestUri.PathAndQuery;
    UriBuilder forwardUri = new UriBuilder(_otherWebSiteBase);
    forwardUri.Path = url;

    HttpRequestMessage newRequest = request.Clone(forwardUri.Uri.ToString());

    HttpResponseMessage responseMessage = await _client.SendAsync(newRequest);
    return responseMessage;
}

克隆方法如下，主要来自这个问题：How to forward an HttpRequestMessage to another server

    public static HttpRequestMessage Clone(this HttpRequestMessage req, string newUri)
    {
        HttpRequestMessage clone = new HttpRequestMessage(req.Method, newUri);

        if (req.Method != HttpMethod.Get)
        {
            clone.Content = req.Content;
        }
        clone.Version = req.Version;

        foreach (KeyValuePair<string, object> prop in req.Properties)
        {
            clone.Properties.Add(prop);
        }

        foreach (KeyValuePair<string, IEnumerable<string>> header in req.Headers)
        {
            clone.Headers.TryAddWithoutValidation(header.Key, header.Value);
        }
        clone.Headers.Host = new Uri(newUri).Authority;
        return clone;
    }

无法使用此动词类型通过GET请求发送内容正文

1 个答案: