Table of Contents for
Squid: The Definitive Guide
Squid: The Definitive Guide
Published by
O'Reilly Media, Inc., 2004
- Cover
- Squid: The Definitive Guide
- Squid: The Definitive Guide
- Dedication
- Preface
- 1. Introduction
- 2. Getting Squid
- 3. Compiling and Installing
- 4. Configuration Guide for the Eager
- 5. Running Squid
- 6. All About Access Controls
- 7. Disk Cache Basics
- 8. Advanced Disk Cache Topics
- 9. Interception Caching
- 10. Talking to Other Squids
- 11. Redirectors
- 12. Authentication Helpers
- 13. Log Files
- 14. Monitoring Squid
- 15. Server Accelerator Mode
- 16. Debugging and Troubleshooting
- A. Config File Reference
- http_port
- https_port
- ssl_unclean_shutdown
- icp_port
- htcp_port
- mcast_groups
- udp_incoming_address
- udp_outgoing_address
- cache_peer
- cache_peer_domain
- neighbor_type_domain
- icp_query_timeout
- maximum_icp_query_timeout
- mcast_icp_query_timeout
- dead_peer_timeout
- hierarchy_stoplist
- no_cache
- cache_access_log
- cache_log
- cache_store_log
- cache_swap_log
- emulate_httpd_log
- log_ip_on_direct
- cache_dir
- cache_mem
- cache_swap_low
- cache_swap_high
- maximum_object_size
- minimum_object_size
- maximum_object_size_in_memory
- cache_replacement_policy
- memory_replacement_policy
- store_dir_select_algorithm
- mime_table
- ipcache_size
- ipcache_low
- ipcache_high
- fqdncache_size
- log_mime_hdrs
- useragent_log
- referer_log
- pid_filename
- debug_options
- log_fqdn
- client_netmask
- ftp_user
- ftp_list_width
- ftp_passive
- ftp_sanitycheck
- cache_dns_program
- dns_children
- dns_retransmit_interval
- dns_timeout
- dns_defnames
- dns_nameservers
- hosts_file
- diskd_program
- unlinkd_program
- pinger_program
- redirect_program
- redirect_children
- redirect_rewrites_host_header
- redirector_access
- redirector_bypass
- auth_param
- authenticate_ttl
- authenticate_cache_garbage_interval
- authenticate_ip_ttl
- external_acl_type
- wais_relay_host
- wais_relay_port
- request_header_max_size
- request_body_max_size
- refresh_pattern
- quick_abort_min
- quick_abort_max
- quick_abort_pct
- negative_ttl
- positive_dns_ttl
- negative_dns_ttl
- range_offset_limit
- connect_timeout
- peer_connect_timeout
- read_timeout
- request_timeout
- persistent_request_timeout
- client_lifetime
- half_closed_clients
- pconn_timeout
- ident_timeout
- shutdown_lifetime
- acl
- http_access
- http_reply_access
- icp_access
- miss_access
- cache_peer_access
- ident_lookup_access
- tcp_outgoing_tos
- tcp_outgoing_address
- reply_body_max_size
- cache_mgr
- cache_effective_user
- cache_effective_group
- visible_hostname
- unique_hostname
- hostname_aliases
- announce_period
- announce_host
- announce_file
- announce_port
- httpd_accel_host
- httpd_accel_port
- httpd_accel_single_host
- httpd_accel_with_proxy
- httpd_accel_uses_host_header
- dns_testnames
- logfile_rotate
- append_domain
- tcp_recv_bufsize
- err_html_text
- deny_info
- memory_pools
- memory_pools_limit
- forwarded_for
- log_icp_queries
- icp_hit_stale
- minimum_direct_hops
- minimum_direct_rtt
- cachemgr_passwd
- store_avg_object_size
- store_objects_per_bucket
- client_db
- netdb_low
- netdb_high
- netdb_ping_period
- query_icmp
- test_reachability
- buffered_logs
- reload_into_ims
- always_direct
- never_direct
- header_access
- header_replace
- icon_directory
- error_directory
- maximum_single_addr_tries
- snmp_port
- snmp_access
- snmp_incoming_address
- snmp_outgoing_address
- as_whois_server
- wccp_router
- wccp_version
- wccp_incoming_address
- wccp_outgoing_address
- delay_pools
- delay_class
- delay_access
- delay_parameters
- delay_initial_bucket_level
- incoming_icp_average
- incoming_http_average
- incoming_dns_average
- min_icp_poll_cnt
- min_dns_poll_cnt
- min_http_poll_cnt
- max_open_disk_fds
- offline_mode
- uri_whitespace
- broken_posts
- mcast_miss_addr
- mcast_miss_ttl
- mcast_miss_port
- mcast_miss_encode_key
- nonhierarchical_direct
- prefer_direct
- strip_query_terms
- coredump_dir
- ignore_unknown_nameservers
- digest_generation
- digest_bits_per_entry
- digest_rebuild_period
- digest_rewrite_period
- digest_swapout_chunk_size
- digest_rebuild_chunk_percentage
- chroot
- client_persistent_connections
- server_persistent_connections
- pipeline_prefetch
- extension_methods
- request_entities
- high_response_time_warning
- high_page_fault_warning
- high_memory_warning
- ie_refresh
- vary_ignore_expire
- sleep_after_fork
- B. The Memory Cache
- C. Delay Pools
- D. Filesystem Performance Benchmarks
- E. Squid on Windows
- F. Configuring Squid Clients
- About the Author
- Colophon
- Copyright
Name
no_cache
Synopsis
no_cache is a sequence of access control rules (see Section 6.2) that specify responses that must not be cached by Squid. Of course, Squid has some hardcoded rules for responses that must not be cached according to the HTTP RFC. The no_cache rules are in addition to those.
The no_cache syntax is a little tricky. You
must use deny for rules where the
response must not be cached. Consider this example:
acl GoodStuff url_regex /foo/bar/ acl BadStuff url_regex /bar/ no_cache allow GoodStuff no_cache deny BadStuff
Here, a URL containing /foo/bar/ may be cached, but any other URL
containing only /bar/ isn’t cached.
The meaning of the allow and
deny might be the opposite of what
you expect. Just remember that deny
carries the same negative connotation as “not caching”
something.