R语言调用JSON API遭遇SSL连接错误，求解决思路

Hey Steven, sorry to hear you're stuck with that SSL connect error while trying to pull data from the target endpoint. Let's go through actionable fixes to get this working:

• Bypass SSL certificate verification (temporary workaround)
  Sometimes R's default SSL certificate store doesn't trust the server's certificate. You can use the httr package to override this check (note: only do this if you trust the server, as it skips security validation):

  library(jsonlite)
  library(httr)
  
  # Fetch the response with SSL verification disabled
  response <- GET("https://db.cilaboratory.org:8080/naemp/sites", config(ssl_verifypeer = FALSE))
  # Parse the JSON content
  sites <- fromJSON(content(response, "text"))
  

• Update R and related packages
  Outdated versions of R, jsonlite, or httr might lack support for modern SSL protocols. Run these commands to update everything:

  # Update all installed packages
  update.packages(ask = FALSE)
  # Reinstall jsonlite and httr if needed
  install.packages(c("jsonlite", "httr"))
  

  Also, make sure your system's SSL library (like OpenSSL) is up to date—this varies by OS (check your system's package manager for updates).

• Check proxy settings
  If you're on a corporate or restricted network, a proxy might be blocking the SSL connection. Add proxy configuration to your request using use_proxy:

  response <- GET("https://db.cilaboratory.org:8080/naemp/sites", 
                  config(ssl_verifypeer = FALSE, 
                         use_proxy(url = "your_proxy_host", port = 8080))) # Replace with your proxy details
  sites <- fromJSON(content(response, "text"))
  

• Test server reachability outside R
  Open your terminal and run this curl command to diagnose the SSL handshake directly:

  curl -v https://db.cilaboratory.org:8080/naemp/sites
  

  Look for errors related to certificate validity, protocol mismatches, or connection timeouts. If curl also fails, the issue might be with the server itself or your network firewall blocking port 8080.

内容的提问来源于stack exchange，提问作者Steven Bittner