From 415c7ca082f922242f2d8e7214b92f4b5c14bdb6 Mon Sep 17 00:00:00 2001
From: MingNian <1281442923@qq.com>
Date: Sun, 21 Jun 2026 21:15:02 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E8=AF=B7=E6=B1=82=E4=BD=93=E8=A7=A3?=
 =?UTF-8?q?=E6=9E=90=E5=A4=B1=E8=B4=A5=E8=BF=94=E5=9B=9E=20400=20=E8=80=8C?=
 =?UTF-8?q?=E9=9D=9E=20500?=
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ExceptionMiddleware 捕获 BadHttpRequestException(非法 JSON/编码错误/请求体过大等），
按其携带的状态码返回（通常 400），避免把客户端请求格式问题误报为服务器内部错误。
---
 .../src/Health.WebApi/Middleware/exception_middleware.cs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/backend/src/Health.WebApi/Middleware/exception_middleware.cs b/backend/src/Health.WebApi/Middleware/exception_middleware.cs
index c7254bc..bcc41d1 100644
--- a/backend/src/Health.WebApi/Middleware/exception_middleware.cs
+++ b/backend/src/Health.WebApi/Middleware/exception_middleware.cs
@@ -24,6 +24,15 @@ public sealed class ExceptionMiddleware(RequestDelegate next, ILogger<ExceptionM
             var result = new { code = 40001, data = (object?)null, message = vex.Message };
             await context.Response.WriteAsync(JsonSerializer.Serialize(result));
         }
+        catch (Microsoft.AspNetCore.Http.BadHttpRequestException ex)
+        {
+            // 请求体无法解析（非法 JSON、编码错误、请求体过大等）：返回其携带的状态码（通常 400），而不是 500
+            _logger.LogWarning(ex, "请求解析失败: {Path}", context.Request.Path);
+            context.Response.StatusCode = ex.StatusCode;
+            context.Response.ContentType = "application/json";
+            var result = new { code = 40001, data = (object?)null, message = "请求格式不正确" };
+            await context.Response.WriteAsync(JsonSerializer.Serialize(result));
+        }
         catch (Exception ex)
         {
             // 生产环境不暴露内部异常详情