拦截Web API请求并更改正文/内容 [英] Intercept Web API Request and change body/content

问题描述

您好，



我正在Web API应用程序中试验OWIN中间件，我希望拦截管道中的请求并解码之前的请求正文请求到达API Controller / Action。



我已经采用了json字符串，base 64编码了它作为此测试的一部分。我能够拦截请求，读取正文，解码它以获取原始字符串，但我无法使用新数据更新请求正文。以下是代码段：

Hello,

I am experimenting with OWIN middleware in an Web API application and I wish to intercept the request in the pipeline and decode the request body in flight before the request gets to the API Controller/Action.

I have taken a json string and base 64 encoded it as part of this test. I am able to intercept the request, read the body text, decode it as to get the original string but I am unable to update the request body with the new data. Here is a code snippet:

public override async Task Invoke(IOwinContext context)
        {
            if (context.Request.ContentType.Equals("text/plain"))
            {
                string body = new StreamReader(context.Request.Body).ReadToEnd();

                byte[] data = Convert.FromBase64String(body);
                string decodedString = Encoding.UTF8.GetString(data);

                context.Request.ContentType = "application/json";
                context.Request.Body = new MemoryStream(Encoding.UTF8.GetBytes(decodedString));
            }

            await Next.Invoke(context);
        }

此代码执行没有问题，我可以看到具有正确数据的已解码字符串值。踢球者是当请求移动到控制器/动作时，正文是旧数据/编码字符串的主体。



有没有人试图拦截api通过owin请求并将其替换为最初发布的内容以外的其他内容？



示例控制器/动作剪切用于从请求正文中提取值：

This code executes without issue and I can see decoded string value having the correct data. The kicker is that when the request moves on to the controller / action, the body is that of the old data / encoded string.

Has anyone tried to intercept the api request via owin and replace it with something other than what was originally posted?

Sample controller / action snipped used to pull the value from the request body:

// POST api/values
        public void Post([FromBody]string value)
        {
            var req = Request;
            var x = value;

            var y = x;
        }

提前致谢！



CC



-

Thanks in advance!

CC

-

推荐答案

以下链接将帮助您：



http://stackoverflow.com/questions/27036448/how-to-intercept-404-using-owin-middleware [ ^ ]



https：/ /maximelabelle.wordpress.com/2014/10/08/capturing-rest-api-calls-with-an-owin-middleware/ [ ^ ]

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