Question

我们在Azure的VM上托管了一个应用程序，该应用程序位于WAF的后面，某些用户遇到了很多麻烦。

某些用户受到HTTP错误400的困扰。请求标头的大小太长。该应用程序受Azure AD登录保护。

对浏览器的完整答复是：

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
{
    "data": "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\"\"http://www.w3.org/TR/html4/strict.dtd\">\r\n<HTML><HEAD><TITLE>Bad Request</TITLE>\r\n<META HTTP-EQUIV=\"Content-Type\" Content=\"text/html; charset=us-ascii\"></HEAD>\r\n<BODY><h2>Bad Request - Request Too Long</h2>\r\n<hr><p>HTTP Error 400. The size of the request headers is too long.</p>\r\n</BODY></HTML>\r\n",
    "status": 400,
    "config": {
        "method": "GET",
        "transformRequest": [
            null
        ],
        "transformResponse": [
            null
        ],
        "url": "api/datacontext/workbooks/876dac86e00e42878d9e239a8efb00a3/session/start",
        "headers": {
            "Accept": "application/json, text/plain, */*",
            "x-invision-app-language": "EN",
            "Authorization": "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6ImFQY3R3X29kdlJPb0VOZzNWb09sSWgydGlFcyIsImtpZCI6ImFQY3R3X29kdlJPb0VOZzNWb09sSWgydGlFcyJ9.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.aghrUBArpEvvvXBs2MBPTCL2nUPZ3aMCJ-1r3EqB5a9UaqaX7Ego5mSw1gb_68y3KhsGfO7kAv49uCB7cy80kEXV4ES4htLefQmmp-Bx-1Et_w6vstoki9ojWuKP97NsaGlQBjPYCZcbCRptBIZJIr_H71dMuFhAPWYEImcGtOrF2RNQA4AFvlx6WL2dIONHVPar3sjgLWEvFxhPFZsml3Ht3M1OtLj5drAJrkUjgxfV3-00bqCwYCm5_t_BAtxWsd-LZEpjDLpN7nDBFIJF14oFrPB7yXCBM_q-Y4FCCwGE14NoRcUrJNJPYMt5b0LKHEAbIopdq_zmFQ6XnUmcjg"
        },
        "withCredentials": true
    },
    "statusText": "Bad Request"
}

该错误显示在应用程序的不同路径中，并且似乎随机出现。它可能会工作一段时间，然后用户再次收到错误消息。由于将流量直接更改为直接流到IIS Web服务器时，用户看不到这些错误，因此我们将问题范围缩小到了WAF。似乎无处可更改我可以在WAF中找到的请求标头的大小限制。任何人都知道从哪里开始寻找解决方案？

Azure WAF的配置如下：

配置

Tier: WAF
Firewall Status: Enabled
Firewall mode: Detection

There are no exclusions configured. 

Global Parameters: 
Inspect request body: Off

规则

Rule set: OWASP 3.0
Advanced rule configuration: Disabled

Azure应用程序网关WAF：HTTP错误400。请求标头的大小太长

0 个答案: