Problem Description:
An error is reported when logging in in a new browser

Error content:

Debug mode error content:
POST https://edinburgh.ucsslo.cn/ 405

Solutions tried:
clear cache
Downgrade to 1.7.2

composer.json

{
    "name": "flarum/flarum",
    "description": "Delightfully simple forum software.",
    "type": "project",
    "keywords": [
        "forum",
        "discussion"
    ],
    "homepage": "https://flarum.org/",
    "license": "MIT",
    "authors": [
        {
            "name": "Flarum",
            "email": "info@flarum.org",
            "homepage": "https://flarum.org/team"
        }
    ],
    "support": {
        "issues": "https://github.com/flarum/core/issues",
        "source": "https://github.com/flarum/flarum",
        "docs": "https://docs.flarum.org/"
    },
    "require": {
        "afrux/news-widget": "*",
        "akito/flarum-limit-post-length": "^0.1.0",
        "antoinefr/flarum-ext-money": "^1.3",
        "antoinefr/flarum-ext-online": "^1.0",
        "askvortsov/flarum-auto-moderator": "*",
        "askvortsov/flarum-categories": "^3.0",
        "askvortsov/flarum-checklist": "*",
        "askvortsov/flarum-discussion-templates": "^0.8.3",
        "askvortsov/flarum-markdown-tables": "*",
        "askvortsov/flarum-moderator-warnings": "^0.6.1",
        "askvortsov/flarum-pwa": "^3.2",
        "askvortsov/flarum-rich-text": "*",
        "aurorum/flarum-better-iframe": "^2.0",
        "becod/flarum-backtotop": "*",
        "blomstra/cache-assets": "*",
        "blomstra/fontawesome": "*",
        "blomstra/turnstile": "*",
        "blomstra/usercard-stats": "*",
        "clarkwinkelmann/flarum-ext-author-change": "^1.0",
        "clarkwinkelmann/flarum-ext-email-whitelist": "^1.0",
        "clarkwinkelmann/flarum-ext-emojionearea": "^1.0",
        "clarkwinkelmann/flarum-ext-group-invitation": "^1.0",
        "clarkwinkelmann/flarum-ext-popular-discussion-badge": "^1.1",
        "clarkwinkelmann/flarum-ext-reset-preferences": "^1.0",
        "clarkwinkelmann/flarum-ext-sudo-mode": "^1.0",
        "clarkwinkelmann/flarum-ext-who-read": "^1.4",
        "darkle/fancybox": "^1.1",
        "datlechin/flarum-birthdays-widget": "*",
        "datlechin/flarum-discussion-overview": "*",
        "datlechin/flarum-keyboard-shortcuts": "*",
        "datlechin/flarum-link-preview": "*",
        "datlechin/flarum-offline-indicator": "*",
        "datlechin/flarum-traditional-rank-icons": "*",
        "davwheat/flarum-ext-ads": "*",
        "extiverse/mercury": "*",
        "flarum-lang/chinese-simplified": "^1.3",
        "flarum/approval": "*",
        "flarum/bbcode": "*",
        "flarum/core": "^1.7",
        "flarum/emoji": "*",
        "flarum/flags": "*",
        "flarum/lang-english": "*",
        "flarum/likes": "*",
        "flarum/lock": "*",
        "flarum/markdown": "*",
        "flarum/mentions": "*",
        "flarum/nicknames": "*",
        "flarum/pusher": "*",
        "flarum/statistics": "*",
        "flarum/sticky": "*",
        "flarum/subscriptions": "*",
        "flarum/suspend": "*",
        "flarum/tags": "*",
        "fof/analytics": "*",
        "fof/ban-ips": "*",
        "fof/best-answer": "*",
        "fof/byobu": "*",
        "fof/cookie-consent": "^1.1",
        "fof/custom-footer": "^1.1",
        "fof/default-group": "*",
        "fof/default-user-preferences": "*",
        "fof/disposable-emails": "*",
        "fof/doorman": "*",
        "fof/drafts": "*",
        "fof/follow-tags": "*",
        "fof/formatting": "*",
        "fof/forum-statistics-widget": "*",
        "fof/frontpage": "^1.1",
        "fof/geoip": "*",
        "fof/github-autolink": "^1.0",
        "fof/html-errors": "^1.1",
        "fof/ignore-users": "*",
        "fof/impersonate": "*",
        "fof/links": "^1.1",
        "fof/merge-discussions": "*",
        "fof/nightmode": "*",
        "fof/oauth": "^1.3",
        "fof/passport": "*",
        "fof/polls": "^1.3",
        "fof/pretty-mail": "*",
        "fof/prevent-necrobumping": "^1.1",
        "fof/profile-image-crop": "*",
        "fof/reactions": "*",
        "fof/realtimelogin": "^1.0",
        "fof/recaptcha": "*",
        "fof/secure-https": "*",
        "fof/share-social": "^1.1",
        "fof/socialprofile": "^1.1",
        "fof/spamblock": "*",
        "fof/split": "*",
        "fof/subscribed": "*",
        "fof/terms": "^1.2",
        "fof/upload": "^1.2",
        "fof/user-bio": "*",
        "fof/user-directory": "*",
        "fof/username-request": "*",
        "ganuonglachanh/sonic": "^0.1.8",
        "glowingblue/password-strength": "*",
        "ianm/follow-users": "*",
        "imeepo/flarum-daily-check-in": "^1.1",
        "jslirola/flarum-ext-login2seeplus": "^0.2.1",
        "justoverclock/be-active-user-indicator": "*",
        "justoverclock/custom-header": "*",
        "justoverclock/events-countdown": "*",
        "justoverclock/flarum-ext-socialcards": "^1.0",
        "justoverclock/geo-weather": "*",
        "justoverclock/youtube-video-feed": "*",
        "katosdev/signature": "^1.1",
        "league/flysystem-aws-s3-v3": "1.*",
        "matteociaroni/flarum-public-suspensions": "^1.0",
        "migratetoflarum/fake-data": "^1.4",
        "nearata/flarum-ext-copy-code-to-clipboard": "^2.1",
        "nearata/flarum-ext-login-notification": "*",
        "nearata/flarum-ext-maintenance-mode": "*",
        "nearata/flarum-ext-minecraft-avatars": "^2.1",
        "nearata/flarum-ext-password-strength-enforcer": "*",
        "nearata/flarum-ext-prevent-double-posting": "*",
        "nearata/flarum-ext-signup-confirm-password": "^3.0",
        "nearata/flarum-ext-twofactor": "*",
        "ralkage/flarum-hcaptcha": "*",
        "sycho/flarum-profile-cover": "^1.3",
        "the-turk/flarum-diff": "^1.1",
        "therealsujitk/flarum-ext-gifs": "*",
        "v17development/flarum-blog": "^0.6.5",
        "v17development/flarum-seo": "^1.8",
        "v17development/flarum-user-badges": "^1.1",
        "wanecho/mobile-tab": "2.0.1",
        "wanecho/showfloor": "*",
        "webbinaro/flarum-calendar": "^1.0",
        "yannisme/oxotheme": "^2.1",
        "zequeen/acgembed-remastered": "^1.1",
        "zerosonesfun/composer-preview": "^1.1",
        "zerosonesfun/direct-links": "^3.1",
        "ziiven/flarum-fireworks": "^0.1.1",
        "ziiven/flarum-money-leaderboard": "^0.1.7"
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "allow-plugins": {
            "easywechat-composer/easywechat-composer": false,
            "php-http/discovery": true
        }
    }
}

config.php

<?php return array (
  'debug' => false,
  'database' => 
  array (
    'driver' => 'mysql',
    'host' => '?',
    'port' => ?,
    'database' => '?',
    'username' => '?',
    'password' => '?',
    'charset' => 'utf8mb4',
    'collation' => 'utf8mb4_unicode_ci',
    'prefix' => 'flarum_',
    'strict' => false,
    'engine' => 'InnoDB',
    'prefix_indexes' => true,
  ),
  'url' => 'https://edinburgh.ucsslo.cn',
  'paths' => 
  array (
    'api' => 'api',
    'admin' => 'admin',
  ),
  'headers' => 
  array (
    'poweredByHeader' => true,
    'referrerPolicy' => 'same-origin',
  ),
);