feat: enhance squid config

Author: fatelei

docker/ssrf_proxy/squid.conf.template

@@ -54,3 +54,52 @@ http_access allow src_all
 
 # Unless the option's size is increased, an error will occur when uploading more than two files.
 client_request_buffer_max_size 100 MB
+
+################################## Performance & Concurrency ###############################
+# Increase file descriptor limit for high concurrency
+max_filedescriptors 65536
+
+# Timeout configurations for image requests
+connect_timeout 30 seconds
+request_timeout 2 minutes
+read_timeout 2 minutes
+client_lifetime 5 minutes
+shutdown_lifetime 30 seconds
+
+# Persistent connections - improve performance for multiple requests
+server_persistent_connections on
+client_persistent_connections on
+persistent_request_timeout 30 seconds
+pconn_timeout 1 minute
+
+# Connection pool and concurrency limits
+client_db_limit 1000
+server_idle_pconn_timeout 2 minutes
+client_idle_pconn_timeout 2 minutes
+
+# Quick abort settings - don't abort requests that are mostly done
+quick_abort_min 16 KB
+quick_abort_max 16 MB
+quick_abort_pct 95
+
+# Memory and cache optimization
+memory_cache_mode disk
+cache_mem 256 MB
+maximum_object_size_in_memory 512 KB
+
+# DNS resolver settings for better performance
+dns_timeout 30 seconds
+dns_retransmit_interval 5 seconds
+# By default, Squid uses the system's configured DNS resolvers.
+# If you need to override them, set dns_nameservers to appropriate servers
+# for your environment (for example, internal/corporate DNS). The following
+# is an example using public DNS and SHOULD be customized before use:
+# dns_nameservers 8.8.8.8 8.8.4.4
+
+# Logging format for better debugging
+logformat combined %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
+access_log daemon:/var/log/squid/access.log combined
+
+# Access log to track concurrent requests and timeouts
+logfile_rotate 10
+