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Azure APIM策略，用于在超时情况下将主后端URL故障切换到辅助后端URL

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Azure APIM策略，用于在超时情况下将主后端URL故障切换到辅助后端URL,azure,azure-api-management,policies,Azure,Azure Api Management,Policies,我的要求相当简单。我有一个APIM端点，它调用具有预定义超时的后端HTTP服务。如果请求超时或返回的错误不是“错误请求”（状态代码>400），则需要使用故障转移HTTP服务重试调用，直到成功或最多5次。我正试图用APIM政策来实现这一点。当返回的状态代码高于400时，重试和故障转移可以工作，但如果请求只是超时，则不会发生这种情况。如果请求只是超时，控件甚至不会进入块。我相当确定我设置的重试条件不能捕获超时条件。有人能帮我弄清楚用于记录超时的APIM策略吗 以下是APIM政策 <polici

我的要求相当简单。我有一个APIM端点，它调用具有预定义超时的后端HTTP服务。如果请求超时或返回的错误不是“错误请求”（
状态代码>400）
，则需要使用故障转移HTTP服务重试调用，直到成功或最多5次。我正试图用APIM政策来实现这一点。当返回的状态代码高于400时，重试和故障转移可以工作，但如果请求只是超时，则不会发生这种情况。如果请求只是超时，控件甚至不会进入
块。我相当确定我设置的重试条件不能捕获超时条件。有人能帮我弄清楚用于记录超时的APIM策略吗

以下是APIM政策

<policies>
    <inbound>
        <base />
        <set-variable name="isFlag" value="true" />
    </inbound>
    <backend>
        <choose>
            <when condition="@(context.Variables.GetValueOrDefault<string>("isFlag") == "true")">
                <set-backend-service base-url="<primary url>" />
                <forward-request timeout="5" />
                <retry condition="@(context.Response == null || context.Response.StatusCode > 400)" count="5" interval="1" first-fast-retry="true">
                    <set-backend-service base-url="<secondary url>" />                        
                </retry>
            </when>
        </choose>
    </backend>
    <outbound>
        <base />
    </outbound>
    <on-error>
        <base />        
    </on-error>
</policies>
以下是APIM跟踪的摘录

Inbound
(3.014 ms)
api-inspector (0.403 ms)
{
    "request": {
        "method": "GET",
        "url": "https://gpcshare-apim-gpc-dev-aes.azure-api.net/statcode/405?sleep=7000",
        "headers": [
            {
                "name": "Ocp-Apim-Subscription-Key",
                "value": "a02f7f4e18d54d84ba55d4f122548072"
            },
            {
                "name": "Sec-Fetch-Site",
                "value": "cross-site"
            },
            {
                "name": "Sec-Fetch-Mode",
                "value": "cors"
            },
            {
                "name": "X-Forwarded-For",
                "value": "103.111.183.78"
            },
            {
                "name": "Cache-Control",
                "value": "no-cache, no-store"
            },
            {
                "name": "Via",
                "value": "ICAP/1.0 bmg70302.ibosscloud.com (IBOSS/0.4.4 iboss ICAP service )"
            },
            {
                "name": "Content-Type",
                "value": "text/plain;charset=UTF-8"
            },
            {
                "name": "Accept",
                "value": "*/*"
            },
            {
                "name": "Accept-Encoding",
                "value": "gzip,deflate,br"
            },
            {
                "name": "Accept-Language",
                "value": "en-US,en;q=0.9"
            },
            {
                "name": "Host",
                "value": "gpcshare-apim-gpc-dev-aes.azure-api.net"
            },
            {
                "name": "Referer",
                "value": "https://apimanagement.hosting.portal.azure.net/apimanagement/Content/1.42.0.1/apimap//apimap-apis/index.html?clientOptimizations=undefined&l=en.en-us&trustedAuthority=https%3A%2F%2Fportal.azure.com&shellVersion=undefined"
            }
        ]
    }
}
api-inspector (0.004 ms)
{
    "configuration": {
        "api": {
            "from": "/statcode",
            "to": null,
            "version": null,
            "revision": "1"
        },
        "operation": {
            "method": "GET",
            "uriTemplate": "/{code}"
        },
        "user": "-",
        "product": "-"
    }
}
cors (2.601 ms)
"Origin header was missing or empty and the request was classified as not cross-domain. CORS policy was not applied."
cors (0.002 ms)
"Origin header was missing or empty and the request was classified as not cross-domain. CORS policy was not applied."
set-variable (0.003 ms)
{
    "message": "Context variable was successfully set.",
    "name": "isFlag",
    "value": "true"
}
Backend
(4,991.587 ms)↑ Back to top
choose (0.017 ms)
{
    "message": "Expression was successfully evaluated.",
    "expression": "context.Variables.GetValueOrDefault<string>(\"isFlag\") == \"true\"",
    "value": true
}
set-backend-service (0.007 ms)
{
    "message": "Backend service URL was changed.",
    "oldBackendServiceUrl": "",
    "newBackendServiceUrl": "https://httpstat.us/",
    "request": {
        "url": "https://httpstat.us/405?sleep=7000"
    }
}
forward-request (0.151 ms)
{
    "message": "Request is being forwarded to the backend service. Timeout set to 5 seconds",
    "request": {
        "method": "GET",
        "url": "https://httpstat.us/405?sleep=7000",
        "headers": [
            {
                "name": "Host",
                "value": "httpstat.us"
            },
            {
                "name": "Request-Id",
                "value": "|f595c50c66d7453c97a7dc14c9c1af9e.2b06f656cb6c4704_b907aebb."
            },
            {
                "name": "Ocp-Apim-Subscription-Key",
                "value": "a02f7f4e18d54d84ba55d4f122548072"
            },
            {
                "name": "Sec-Fetch-Site",
                "value": "cross-site"
            },
            {
                "name": "Sec-Fetch-Mode",
                "value": "cors"
            },
            {
                "name": "X-Forwarded-For",
                "value": "103.111.183.78,13.91.254.72"
            },
            {
                "name": "Cache-Control",
                "value": "no-cache, no-store"
            },
            {
                "name": "Via",
                "value": "ICAP/1.0 bmg70302.ibosscloud.com (IBOSS/0.4.4 iboss ICAP service )"
            },
            {
                "name": "Content-Type",
                "value": "text/plain;charset=UTF-8"
            },
            {
                "name": "Accept",
                "value": "*/*"
            },
            {
                "name": "Accept-Encoding",
                "value": "gzip,deflate,br"
            },
            {
                "name": "Accept-Language",
                "value": "en-US,en;q=0.9"
            },
            {
                "name": "Referer",
                "value": "https://apimanagement.hosting.portal.azure.net/apimanagement/Content/1.42.0.1/apimap//apimap-apis/index.html?clientOptimizations=undefined&l=en.en-us&trustedAuthority=https%3A%2F%2Fportal.azure.com&shellVersion=undefined"
            }
        ]
    }
}
forward-request (4,991.413 ms)
{
    "messages": [
        "Error occured while calling backend service.",
        "Request to the backend service timed out"
    ]
}
Outbound
(0.183 ms)↑ Back to top
transfer-response (0.067 ms)
{
    "message": "Response headers have been sent to the caller."
}
transfer-response (0.116 ms)
{
    "message": "Response body streaming to the caller is complete."
}

入站
（3.014毫秒）
api检查员（0.403毫秒）
{
“请求”：{
“方法”：“获取”，
“url”：”https://gpcshare-apim-gpc-dev-aes.azure-api.net/statcode/405?sleep=7000",
“标题”：[
{
“名称”：“Ocp Apim订阅密钥”，
“值”：“a02f7f4e18d54d84ba55d4f122548072”
},
{
“名称”：“Sec获取站点”，
“值”：“跨站点”
},
{
“名称”：“秒提取模式”，
“值”：“cors”
},
{
“名称”：“X-Forwarded-For”，
“值”：“103.111.183.78”
},
{
“名称”：“缓存控制”，
“值”：“无缓存，无存储”
},
{
“名称”：“通过”，
“值”：“ICAP/1.0 bmg70302.ibosscloud.com（IBOSS/0.4.4 IBOSS ICAP服务）”
},
{
“名称”：“内容类型”，
“值”：“文本/纯文本；字符集=UTF-8”
},
{
“名称”：“接受”，
“值”：“*/*”
},
{
“名称”：“接受编码”，
“值”：“gzip，deflate，br”
},
{
“名称”：“接受语言”，
“值”：“en-US，en；q=0.9”
},
{
“名称”：“主机”，
“值”：“gpcshare-apim-gpc-dev-aes.azure-api.net”
},
{
“姓名”：“推荐人”，
“值”：https://apimanagement.hosting.portal.azure.net/apimanagement/Content/1.42.0.1/apimap//apimap-apis/index.html?clientOptimizations=undefined&l=en.en-us&trustedAuthority=https%3A%2F%2Fportal.azure.com&shellVersion=undefined“
}
]
}
}
api检查员（0.004毫秒）
{
“配置”：{
“api”：{
“发件人”：“/statcode”，
“to”：空，
“版本”：空，
“修订”：“1”
},
“操作”：{
“方法”：“获取”，
“uriTemplate”：“/{code}”
},
“用户”：“-”，
“产品”：“-”
}
}
cors（2.601毫秒）
“原始标头丢失或为空，请求被分类为非跨域。未应用CORS策略。”
cors（0.002毫秒）
“原始标头丢失或为空，请求被分类为非跨域。未应用CORS策略。”
设置变量（0.003毫秒）
{
“消息”：“已成功设置上下文变量。”，
“名称”：“isFlag”，
“值”：“真”
}
后端
（4991.587毫秒）↑ 回到顶端
选择（0.017毫秒）
{
“消息”：“表达式已成功计算。”，
“表达式”：“context.Variables.GetValueOrDefault（\“isFlag\”）==“true\”，
“价值”：真实
}
设置后端服务（0.007毫秒）
{
“消息”：“后端服务URL已更改。”，
“oldBackendServiceUrl”：“”，
“newBackendServiceUrl”：https://httpstat.us/",
“请求”：{
“url”：”https://httpstat.us/405?sleep=7000"
}
}
转发请求（0.151毫秒）
{
“消息”：“请求正在转发到后端服务。超时设置为5秒”，
“请求”：{
“方法”：“获取”，
“url”：”https://httpstat.us/405?sleep=7000",
“标题”：[
{
“名称”：“主机”，
“值”：“httpstat.us”
},
{
“名称”：“请求Id”，
“值”：“f595c50c66d7453c97a7dc14c9c1af9e.2b06f656cb6c4704_b907aebb。”
},
{
“名称”：“Ocp Apim订阅密钥”，
“值”：“a02f7f4e18d54d84ba55d4f122548072”
},
{
“名称”：“Sec获取站点”，
“值”：“跨站点”
},
{
“名称”：“秒提取模式”，
“值”：“cors”
},
{
“名称”：“X-Forwarded-For”，
“值”：“103.111.183.78,13.91.254.72”
},
{
“名称”：“缓存控制”，
“值”：“无缓存，无存储”
},
{
“名称”：“通过”，
“值”：“ICAP/1.0 bmg70302.ibosscloud.com（IBOSS/0.4.4 IBOSS ICAP服务）”
},
{
“名称”：“内容类型”，
“值”：“文本/纯文本；字符集=UTF-8”
},
{
“名称”：“接受”，
“值”：“*/*”
},
{
“名称”：“接受编码”，
“值”：“gzip，deflate，br”
},
{
“名称”：“接受语言”，
“值”：“en-US，en；q=0.9”
},
{
“姓名”：“推荐人”，