.NET 6中间件Http Logging使用介绍

Intro

.NET 6 会引入一个 Http logging 的中间件，可以用来帮助我们比较方便记录请求和响应的信息

Sample

废话不多说，直接来看示例吧

var?builder?=?WebApplication.CreateBuilder(args);

builder.Services.AddControllers();
var?app?=?builder.Build();

app.UseHttpLogging();
app.MapControllers();

app.Run();

dotnet run 运行起来项目，然后访问一个接口就可以看到打印出来的 Http logging 的日志了

info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[1]
??????Request:
??????Protocol:?HTTP/1.1
??????Method:?GET
??????Scheme:?http
??????PathBase:
??????Path:?/weatherforecast
??????Accept:?text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
??????Connection:?keep-alive
??????Host:?localhost:5084
??????User-Agent:?Mozilla/5.0?(Windows?NT?10.0;?Win64;?x64)?AppleWebKit/537.36?(KHTML,?like?Gecko)?Chrome/94.0.4606.54?Safari/537.36
??????Accept-Encoding:?gzip,?deflate,?br
??????Accept-Language:?zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7
??????Cache-Control:?[Redacted]
??????Upgrade-Insecure-Requests:?[Redacted]
??????sec-ch-ua:?[Redacted]
??????sec-ch-ua-mobile:?[Redacted]
??????sec-ch-ua-platform:?[Redacted]
??????Sec-Fetch-Site:?[Redacted]
??????Sec-Fetch-Mode:?[Redacted]
??????Sec-Fetch-User:?[Redacted]
??????Sec-Fetch-Dest:?[Redacted]
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[2]
??????Response:
??????StatusCode:?200
??????Content-Type:?application/json;?charset=utf-8
??????Date:?[Redacted]
??????Server:?[Redacted]
??????Transfer-Encoding:?chunked

默认地， HttpLoggingMiddleware 会记录请求的基本信息（请求地址，协议版本）和请求头信息以及响应状态和响应头信息，对于不在默认列表里的请求头和响应头，值会显示为 [Redacted] ，如果需要记录这个请求头/响应头的值则需要配置 HttpLoggingOptions ，可以在注册服务的时候进行配置，配置示例如下：

builder.Services.AddHttpLogging(options?=>
{
????options.RequestHeaders.Add("Cache-Control");
????options.ResponseHeaders.Add("Server");
});

修改之后，重新启动并请求我们的服务，日志输出如下：

info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[1]
??????Request:
??????Protocol:?HTTP/1.1
??????Method:?GET
??????Scheme:?http
??????PathBase:
??????Path:?/weatherforecast
??????Accept:?text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
??????Connection:?keep-alive
??????Host:?localhost:5084
??????User-Agent:?Mozilla/5.0?(Windows?NT?10.0;?Win64;?x64)?AppleWebKit/537.36?(KHTML,?like?Gecko)?Chrome/94.0.4606.54?Safari/537.36
??????Accept-Encoding:?gzip,?deflate,?br
??????Accept-Language:?zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7
??????Cache-Control:?max-age=0
??????Upgrade-Insecure-Requests:?[Redacted]
??????sec-ch-ua:?[Redacted]
??????sec-ch-ua-mobile:?[Redacted]
??????sec-ch-ua-platform:?[Redacted]
??????Sec-Fetch-Site:?[Redacted]
??????Sec-Fetch-Mode:?[Redacted]
??????Sec-Fetch-User:?[Redacted]
??????Sec-Fetch-Dest:?[Redacted]
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[2]
??????Response:
??????StatusCode:?200
??????Content-Type:?application/json;?charset=utf-8
??????Date:?[Redacted]
??????Server:?Kestrel
??????Transfer-Encoding:?chunked

注意看一下请求头里的 Cache-Control 和响应头里的 Server ，原来都是 [Redacted] ，配置之后就显示正确的值了，如果你要记录自定义的请求头信息，也是类似的配置

接着我们来配置一下记录请求信息和响应信息，可以配置 HttpLoggingOptions 中的 LoggingFields 来指定需要记录哪些信息

builder.Services.AddHttpLogging(options?=>
{
????options.LoggingFields?=?Microsoft.AspNetCore.HttpLogging.HttpLoggingFields.All;
????options.RequestHeaders.Add("Cache-Control");
????options.ResponseHeaders.Add("Server");
});

在上面的基础上增加 LoggingFields 的配置，这里直接配置上所有的信息，此时再来重新请求，查看日志如下：

info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[1]
??????Request:
??????Protocol:?HTTP/1.1
??????Method:?GET
??????Scheme:?http
??????PathBase:
??????Path:?/weatherforecast
??????Host:?localhost:5084
??????User-Agent:?dotnet-HTTPie/0.1.1
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[2]
??????Response:
??????StatusCode:?200
??????Content-Type:?application/json;?charset=utf-8
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[4]
??????ResponseBody:?[{"date":"2021-09-25T23:40:11.0164783+08:00","temperatureC":37,"temperatureF":98,"summary":"Cool"},{"date":"2021-09-26T23:40:11.0164836+08:00","temperatureC":50,"temperatureF":121,"summary":"Warm"},{"date":"2021-09-27T23:40:11.0164838+08:00","temperatureC":-7,"temperatureF":20,"summary":"Scorching"},{"date":"2021-09-28T23:40:11.016484+08:00","temperatureC":39,"temperatureF":102,"summary":"Freezing"},{"date":"2021-09-29T23:40:11.0164842+08:00","temperatureC":4,"temperatureF":39,"summary":"Balmy"}]

可以看到此时的 response body 也记录下来了

我们再来增加一个 POST 的 API 来验证一下 RequestBody 是不是可以正常记录

[HttpPost]
public?IActionResult?Post(System.Text.Json.JsonElement?element)?=>?Ok(element);

使用 dotnet-httpie 执行 http :5084/weatherforecast name=test

请求一下 API，输出日志如下：

info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[1]
??????Request:
??????Protocol:?HTTP/1.1
??????Method:?POST
??????Scheme:?http
??????PathBase:
??????Path:?/weatherforecast
??????Host:?localhost:5084
??????User-Agent:?dotnet-HTTPie/0.1.1
??????Content-Type:?application/json;?charset=utf-8
??????Content-Length:?15
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[3]
??????RequestBody:?{"name":"test"}
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[2]
??????Response:
??????StatusCode:?200
??????Content-Type:?application/json;?charset=utf-8
info:?Microsoft.AspNetCore.HttpLogging.HttpLoggingMiddleware[4]
??????ResponseBody:?{"name":"test"}

More

仔细看上面的示例的话会发现一个问题，当要记录 ResponseBody 的时候，Response header 的信息没有被完全记录下来，感觉像是一个 BUG，提了一个 issue 还没回复，感兴趣的可以参考：<https://github测试数据/dotnet/aspnetcore/issues/36920>

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