HttpClient())
{
for (var i = 0; i < 100; i++)
{
Console.WriteLine(DateTime.Now);
var result = await client.GetAsync("http://localhost:4727/ocelot/ratelimit/5");
Console.WriteLine($"{result.StatusCode}, {result.Content.ReadAsStringAsync().Result}");
System.Threading.Thread.Sleep(1000);
}
Console.Read();
}
}
每隔1s就发出一次请求，运行，在命令窗口得到以下输出：
2019/6/3 13:33:31
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:32
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:33
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:34
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:35
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:36
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:37
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:38
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:39
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:40
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:41
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:43
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:44
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:45
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:46
OK, This is from localhost:8001, path: /api/ocelot/5
2019/6/3 13:33:47
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:48
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:49
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:50
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
2019/6/3 13:33:51
TooManyRequests, API calls quota exceeded! maximum admitted 5 per 1m.
然后，我又通过修改参数，得出如下结果：
- PeriodTimespan=10, Limit=5：5个成功，5个失败
- PeriodTimespan=10, Limit=6：6个成功，4个失败
- PeriodTimespan=20, Limit=5：5个成功，15个失败
- PeriodTimespan=30, Limit=5：5个成功，25个失败
似乎都是与我前面得到的结论相同，与官方文档不一致。
我在GitHub上提了一个issue：https://github.com/ThreeMammals/Ocelot/issues/910，期待能得到答复。
流量限制的全局配置
"RateLimitOptions": {
"DisableRateLimitHeaders": true,
"QuotaExceededMessage": "Customize Tips!",
"HttpStatusCode": 999,
"ClientIdHeader": "Test"
}
- DisableRateLimitHeaders：当设为true时，请求头中就不会输出流量限制的相关信息，默认值："false"
- QuotaExceededMessage：当请求数量超出流量限制时，输出的信息，默认值："API calls quota exceeded! maximum admitted
{Limit} per {Period}."
- HttpStatusCode：当请求数量超出流量限制时，输出的状态码，默认值："429"
- ClientIdHeader：标识为白名单中的客户端的请求头key，默认值："ClientId"
案例七 服务质量
Ocelot支持服务质量与熔断，意味着当下游服务不可用时，Ocelot会进行自动熔断，不再将请求转发给该下游服务。来看看配置
"QoSOptions": {
"ExceptionsAllowedBeforeBreaking":3,
"DurationOfBreak":3000,
"TimeoutValue":5000
}
- ExceptionsAllowedBeforeBreaking：允许异常次数，当Ocelot转发给该下游服务连续出现异常次数达到该数字时，Ocelot会进行自动熔断，一段时间内不再向该下游服务转发请求
- DurationOfBreak：熔断时间，单位为ms（毫秒），持续多长时间不向该下游服务转发请求
- TimeoutValue：服务质量配置项，超时时间，单位为ms（毫秒），当Ocelot向下游服务转发请求多长时间后，自动认为该请求超时
Excep