org.openqa.selenium.WebDriverException：java.net.ConnectException：无法连接到localhost / 127.0.0.1：9340

Question

我有一个应用程序，可以处理HTTP请求，并基于参数运行一些基本的硒操作（例如，打开网页）。 它是用Scala编写的，实际上实际上与Java实现非常接近。 代码示例如下所示：

val firefoxBinary = new FirefoxBinary()
firefoxBinary.addCommandLineOptions("--headless")

val firefoxOptions = new FirefoxOptions()
firefoxOptions.setBinary(firefoxBinary)

val webDriver = new FirefoxDriver(firefoxOptions)
webDriver.get(s"https://google.com")
webDriver.manage().timeouts().pageLoadTimeout(5, TimeUnit.SECONDS)
logger.info(s"Title: ${webDriver.getTitle}")
webDriver.close()

当我在本地运行时，一切正常。 但是当我将其打包在docker容器中时，出现以下错误：

Error servicing request: GET /run-selenium from 172.17.0.1 {{ org.openqa.selenium.WebDriverException: java.net.ConnectException: Failed to connect to localhost/127.0.0.1:9340
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: '4fb27eff9adc', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.9.184-linuxkit', java.version: '1.8.0_212'
Driver info: driver.version: FirefoxDriver }}
org.openqa.selenium.WebDriverException: java.net.ConnectException: Failed to connect to localhost/127.0.0.1:9340
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: '4fb27eff9adc', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.9.184-linuxkit', java.version: '1.8.0_212'
Driver info: driver.version: FirefoxDriver
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:92)

我使用此docker映像作为基础映像：

FROM openjdk:8-jre-alpine3.9
ARG firefox_ver=70.0
ARG geckodriver_ver=0.26.0

# Download and install deps
RUN apk update && apk add curl curl-dev

RUN mkdir /opt/docker && chmod a=rwX /opt/docker

# Download and install Firefox
RUN curl -fL -o /tmp/firefox.tar.bz2 https://ftp.mozilla.org/pub/firefox/releases/${firefox_ver}/linux-x86_64/en-GB/firefox-${firefox_ver}.tar.bz2 \
&& tar -xjf /tmp/firefox.tar.bz2 -C /tmp/ && mv /tmp/firefox /opt/docker

# Download and install geckodriver
RUN curl -fL -o /tmp/geckodriver.tar.gz \
https://github.com/mozilla/geckodriver/releases/download/v${geckodriver_ver}/geckodriver-v${geckodriver_ver}-linux64.tar.gz \
&& tar -xzf /tmp/geckodriver.tar.gz -C /tmp/ && chmod +x /tmp/geckodriver && mv /tmp/geckodriver /opt/docker

ENV PATH="/opt/docker/firefox:${PATH}"