Vercel Serverless Function崩溃排查：SvelteKit GraphQL请求异常

页面初始加载时频繁出现随机错误，网站显示**"This Serverless Function has crashed"**错误：

Vercel完整错误日志 #

[GET] /
14:54:19:39
2022-07-21T12:54:19.426Z    3a175b6b-396b-45d5-b1a1-46072201cd6a    ERROR   Unhandled Promise Rejection     
{"errorType":"Runtime.UnhandledPromiseRejection","errorMessage":"FetchError: request to https://api-eu-central-1.graphcms.com/v2/cl2k6hi1809a401xk4hd3h5zj/master failed, reason: Client network socket disconnected before secure TLS connection was established","reason":{"errorType":"FetchError","errorMessage":"request to https://api-eu-central-1.graphcms.com/v2/cl2k6hi1809a401xk4hd3h5zj/master failed, reason: Client network socket disconnected before secure TLS connection was established","code":"ECONNRESET","message":"request to https://api-eu-central-1.graphcms.com/v2/cl2k6hi1809a401xk4hd3h5zj/master failed, reason: Client network socket disconnected before secure TLS connection was established","type":"system","errno":"ECONNRESET","stack":["FetchError: request to https://api-eu-central-1.graphcms.com/v2/cl2k6hi1809a401xk4hd3h5zj/master failed, reason: Client network socket disconnected before secure TLS connection was established","    at ClientRequest.<anonymous> (/var/task/index.js:7892:18)","    at ClientRequest.emit (node:events:527:28)","    at TLSSocket.socketErrorListener (node:_http_client:454:9)","    at TLSSocket.emit (node:events:527:28)","    at emitErrorNT (node:internal/streams/destroy:157:8)","    at emitErrorCloseNT (node:internal/streams/destroy:122:3)","    at processTicksAndRejections (node:internal/process/task_queues:83:21)"]},"promise":{},"stack":["Runtime.UnhandledPromiseRejection: FetchError: request to https://api-eu-central-1.graphcms.com/v2/cl2k6hi1809a401xk4hd3h5zj/master failed, reason: Client network socket disconnected before secure TLS connection was established","    at process.<anonymous> (file:///var/runtime/index.mjs:775:15)","    at process.emit (node:events:539:35)","    at emit (node:internal/process/promises:140:20)","    at processPromiseRejections (node:internal/process/promises:274:27)","    at processTicksAndRejections (node:internal/process/task_queues:97:32)"]}[ERROR] [1658408059427] LAMBDA_RUNTIME Failed to post handler success response. Http response code: 400.RequestId: 2a0597b4-6684-4f2a-a724-2333b4f9332d Error: Runtime exited with error: exit status 128Runtime.ExitError

SvelteKit端点示例代码 #

import {client} from '$lib/js/graphql-client'
import {projectsQuery} from '$lib/js/graphql-queries'

export async function get() {
        let sm = 640;
        let md = 768;
        let lg = 1024;
        let xl = 1280;
        let xxl = 1536;
        
        const variables = {sm, md, lg, xl, xxl}

        const {projects} = await client.request(projectsQuery, variables) 

        return {
            body: {
                projects, sm, md, lg, xl, xxl
            }
        }
}

相关背景 #

已有其他开发者遇到同类问题，问题根源指向AWS Lambda（Vercel Serverless Functions基于AWS Lambda运行）。

需求 #

• 确认该问题是否由Vercel Serverless Functions/AWS Lambda网络层面问题导致，而非代码逻辑错误
• 寻求可行的规避方案，降低函数崩溃概率

内容的提问来源于stack exchange，提问作者Koen