【发布时间】：2020-11-12 23:52:51
【问题描述】：
我在 docker 容器中有一个全新的 symfony 5 应用程序，我需要在其上接收一些 webhook，因此使用 ngrok 进行隧道。问题是，ngrok 不断向我发送 502 错误，而 localhost 访问却做得很好。 我有点想不通了。
使用本地主机卷曲：
$ curl -v http://localhost:4080/default
* Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 4080 (#0)
> GET /default HTTP/1.1
> Host: localhost:4080
> User-Agent: curl/7.52.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Cache-Control: no-cache, private
< Content-Type: application/json
< Date: Thu, 23 Jul 2020 09:10:43 GMT
< PHP message: [info] Matched route "default".
< X-Powered-By: PHP/7.4.3
< X-Robots-Tag: noindex
< Content-Length: 93
<
* Curl_http_done: called premature == 0
* Connection #0 to host localhost left intact
{"message":"Welcome to your new controller!","path":"src\/Controller\/DefaultController.php"}
使用 localhost 时的 Docker 日志：
payment_1 | [Web Server/PHP ] Jul 23 09:10:43 |INFO | PHP PHP message: Matched route "default". path="/usr/local/sbin/php-fpm" php="7.4.3"
payment_1 | [Web Server/PHP ] Jul 23 09:10:43 |DEBUG| PHP
payment_1 | [Web Server/PHP ] Jul 23 09:10:43 |INFO | SERVER GET (200) ]8;;https://127.0.0.1:8004/default\/default]8;;\ ip="172.20.0.1"
Ngrok 开始于：
$ ngrok http 4080
ngrok by @inconshreveable (Ctrl+C to quit)
Session Status online
Account lulhum (Plan: Free)
Version 2.3.35
Region United States (us)
Web Interface http://127.0.0.1:4040
Forwarding http://8c882c861512.ngrok.io -> http://localhost:4080
Forwarding https://8c882c861512.ngrok.io -> http://localhost:4080
Connections ttl opn rt1 rt5 p50 p90
0 0 0.00 0.00 0.00 0.00
通过 ngrok 卷曲：
$ curl -v http://8c882c861512.ngrok.io/default
* Trying 3.137.63.131...
* TCP_NODELAY set
* Connected to 8c882c861512.ngrok.io (3.137.63.131) port 80 (#0)
> GET /default HTTP/1.1
> Host: 8c882c861512.ngrok.io
> User-Agent: curl/7.52.1
> Accept: */*
>
< HTTP/1.1 502 Bad Gateway
< Content-length: 107
< Cache-Control: no-cache
< Connection: close
< Content-Type: text/html
<
<html><body><h1>502 Bad Gateway</h1>
The server returned an invalid or incomplete response.
</body></html>
* Curl_http_done: called premature == 0
* Closing connection 0
Docker 通过 ngrok 记录日志（和之前一样）：
payment_1 | [Web Server/PHP ] Jul 23 09:17:07 |INFO | PHP PHP message: Matched route "default". path="/usr/local/sbin/php-fpm" php="7.4.3"
payment_1 | [Web Server/PHP ] Jul 23 09:17:07 |DEBUG| PHP
payment_1 | [Web Server/PHP ] Jul 23 09:17:07 |INFO | SERVER GET (200) ]8;;https://127.0.0.1:8004/default\/default]8;;\ ip="172.20.0.1"
Ngrok 控制台（看起来还可以）：
HTTP Requests
-------------
GET /default 200 OK
docker 容器通过 docker compose（docker-compose.yml 提取）与 symfony 开发服务器一起启动：
version: '3'
services:
payment:
build: ./payment
command: sh -c "symfony server:stop && symfony server:start --port=4080"
environment:
APP_DEBUG: 1
VAR_DUMPER_SERVER: payment_dump:8000
volumes:
- "./payment:/app"
- "payment_composer:/root/composer"
expose:
- 4080
ports:
- "4080:4080"
这里是 Dockerfile：
FROM php:7.4-fpm-alpine
RUN apk add --no-cache \
git \
curl \
openssl \
ssmtp \
libzip-dev \
bash
RUN docker-php-ext-install -j$(nproc) \
pcntl \
zip
RUN apk add --no-cache icu-dev
RUN docker-php-ext-install intl
RUN wget https://get.symfony.com/cli/installer -O - | bash \
&& mv /root/.symfony/bin/symfony /usr/local/bin/symfony
RUN curl https://raw.githubusercontent.com/composer/getcomposer.org/d3e09029468023aa4e9dcd165e9b6f43df0a9999/web/installer | php -- --quiet \
&& mv composer.phar /usr/local/bin/composer
WORKDIR /app
ENV TZ="Europe/Paris"
ENV IS_DOCKER=1
我真的不明白出了什么问题。我有其他具有类似配置的容器似乎可以正常工作。 我尝试使用 *:4080 或 http://127.0.0.1:4080 或一些 -host-header 选项重建容器和各种 ngrok 命令。还尝试了不同的端口，但没有结果。 结果在浏览器中当然是一样的。
【问题讨论】：