ASP.NET Web API不允许使用冗长的base64 URI [英] ASP.NET Web API does not allow Lengthy base64 URI

问题描述

我正在尝试从Android客户端接收一个长的base64字符串，然后将其解码为Web API项目中的位图，以作为图像上传到Azure BLOB存储.但是，该项目返回此消息，并拒绝接受参数:

I'm trying to receive a lengthy base64 string from my Android Client and then decode it to a bitmap in my Web API Project to be uploaded as an image to an Azure BLOB Storage. However, the project returns this message and refuses to take in the parameters:

请求URL太长

HTTP错误414.请求URL太长.

HTTP Error 414. The request URL is too long.

显然base64字符串很长.我该如何解决并接受参数?我曾在堆栈中四处寻找类似的问题，但没有一个答案明确指出如何在Web API中对其进行修复.谢谢！

Obviously the base64 string is very long. How do I get around this and accept the parameters? I've looked around stack for a similar question but none of the answers clearly state ho to fix it in a Web API. Thank you!

这是我方法中的代码段:

Here's a code snippet from my method:

[HttpPost]
[Route("api/addnewpost")]
public IHttpActionResult AddNewMediaActivity(string base64String, string caption, string email, string type)
{
            byte[] f = Convert.FromBase64String(base64String);
            //more code........
}

我在Android上的客户代码:

HttpClient hc = new DefaultHttpClient();
String message;

HttpPost p = new HttpPost("http://mymobileaddress.azure-mobile.net/api/addactivity?base64String=" + image + "&caption=" + caption + "&email=" + email + "&type=" + type );
JSONObject object = new JSONObject();
try {
            object.put("base64String", image);
            object.put("email", image);
            object.put("base64String", image);

} catch (Exception ex) {

}

try {
           message = object.toString();

            p.setEntity(new StringEntity(message, "UTF8"));
            p.setHeader("Content-type", "application/json");
            p.setHeader("ACCEPT", "application/json");
            p.setHeader("X-ZUMO-APPLICATION", mobileServiceAppId);
            HttpResponse resp = hc.execute(p);
            if (resp != null) {
                if (resp.getStatusLine().getStatusCode() == 204)
                {

                }
            }

            Log.d("ER", "" + resp.getStatusLine().getStatusCode());
        } catch (Exception e) {
            e.printStackTrace();

        }

推荐答案

数据可以在请求的URL或正文中传输.您当前正在通过URL传输数据.而且，URL仅允许为有限长度.而是将您的base64字符串放在正文中.请参见参数绑定在ASP.NET Web API中.

Data can be either transmitted in the URL of a request, or in the body. You are currently transmitting the data in the URL. And the URL is only allowed to be a finite length. Instead, put your base64 string in the body. See Parameter Binding in ASP.NET Web API.

默认情况下，从URI中提取诸如字符串之类的简单参数.为了强制Web API在正文中寻找它，我们在参数中添加了 [FromBody] 属性.

By default, simple parameters like strings are pulled from the URI. To force Web API to look for it in the body, we add a [FromBody] attribute to the parameter.

[HttpPost]
[Route("api/addnewpost")]
public IHttpActionResult AddNewMediaActivity(string caption, string email,
    string type, [FromBody] string base64String)
{
    byte[] f = Convert.FromBase64String(base64String);
    //more code........
}

并更改您的Android客户端代码，以将base64字符串(而非URL)放入正文中.自从接触Java以来​​已经有一段时间了，我不知道您使用的是什么库，但是我想当您在构建HTTP请求时，可以选择将一些数据添加到Java的主体中.请求.

And change your Android client code to put the base64 string in the body, not the URL. It's been a while since I've touched Java and I don't know what library you're using, but I imagine when you're building your HTTP request that you'll have the option of adding some data to the body of the request.

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