在.net 8中使用HttpClientFactory时日志记录请求body和响应body

1、定义DelegatingHandler

public class LoggingHandler : DelegatingHandler
{
    private readonly ILogger<LoggingHandler> _logger;

    public LoggingHandler(ILogger<LoggingHandler> logger)
    {
        _logger = logger;
    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        // 记录请求信息
        _logger.LogInformation("发送请求: {Method} {Uri}", request.Method, request.RequestUri);
        if (request.Content != null)
        {
            var requestBody = await request.Content.ReadAsStringAsync();
            _logger.LogInformation("请求体: {RequestBody}", requestBody);
        }

        // 调用基类方法发送请求
        var response = await base.SendAsync(request, cancellationToken);

        // 记录响应信息
        _logger.LogInformation("接收到响应: {StatusCode}", response.StatusCode);
        if (response.Content != null)
        {
            var responseBody = await response.Content.ReadAsStringAsync();
            _logger.LogInformation("响应体: {ResponseBody}", responseBody);
        }

        return response;
    }
}

2、注入LoggingHandler 和配置使用LoggingHandler

var builder = WebApplication.CreateBuilder(args);

//xxxxxxx
 
builder.Services.AddTransient<LoggingHandler>();
builder.Services.AddHttpClient().ConfigureHttpClientDefaults(defaults=> defaults.AddHttpMessageHandler<LoggingHandler>());

然后通过注入IHttpClientFactory, 调用CreateClient方法创建HttpClient发起请求即可在日志中查看到请求的body和响应的body了