RSelenium创建服务器失败求助：rsDriver报错及连接被拒

问题背景 #

此前RSelenium运行正常，近期出现异常，已更新核心R包及Java环境，问题仍未解决。

执行代码 #

library(wdman)
library(RSelenium)
library(xml2)
library(selectr)
library(httr)
library(jsonlite)
#start RSelenium
remDr <- rsDriver(
  port = 4445L,
  browser = "firefox"
)
#remDr$open()
remDr <- remoteDriver(port = 4445L,browser = "firefox")

错误信息 #

1. rsDriver初始化报错 #

checking Selenium Server versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
checking chromedriver versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
checking geckodriver versions:
BEGIN: PREDOWNLOAD
Error in (function (url, platform, history, appname, platformregex = platform,  : 
  unused argument (fileregex = "\\.(gz|zip)$")

2. remoteDriver连接失败 #

执行remDr$open()后输出：

[1] "Connecting to remote server"
Error in checkError(res) : 
  Undefined error in httr call. httr output: Failed to connect to localhost port 4445: Connection refused

会话信息 #

sessionInfo()

输出：

R version 4.1.2 (2021-11-01)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19044)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                           
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base      

other attached packages:
[1] jsonlite_1.8.4  httr_1.4.4      selectr_0.4-2   xml2_1.3.3      RSelenium_1.7.9
[6] wdman_0.2.6    

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.9       binman_0.1.2     assertthat_0.2.1 rappdirs_0.3.3   bitops_1.0-7    
 [6] R6_2.5.1         semver_0.2.0     magrittr_2.0.3   stringi_1.7.6    curl_4.3.2      
[11] tools_4.1.2      stringr_1.4.0    yaml_2.3.5       compiler_4.1.2   caTools_1.18.2 

解决方案 #

1. 修复fileregex参数错误
   该错误源于wdman与binman版本不兼容，当前wdman 0.2.6需要更高版本的binman支持。执行以下命令更新binman：

   install.packages("binman")
   

   更新后重启R会话，再尝试运行rsDriver。

2. 解决连接拒绝问题

   • 不要跳过rsDriver初始化直接使用remoteDriver，remoteDriver依赖rsDriver启动的Selenium服务，正确流程是通过rsDriver$client操作浏览器：

     remDr <- rsDriver(port = 4446L, browser = "firefox")
     client <- remDr$client
     client$open()
     

   • 检查端口4445是否被占用，Windows下可在命令行执行netstat -ano | findstr :4445查看，若被占用则更换rsDriver的端口参数（如4446L）。
   • 确保Firefox版本与geckodriver版本兼容，可手动下载对应版本的geckodriver，在rsDriver中指定路径：

     remDr <- rsDriver(
       port = 4446L,
       browser = "firefox",
       geckover = "匹配的版本号",
       geckodriver = "本地geckodriver.exe的完整路径"
     )
     

内容的提问来源于stack exchange，提问作者user007