Remove support for Gopher protocol (#1092)

Gopher code quality remains too low for production use in most environments. The code is a persistent source of vulnerabilities and fixing it requires significant effort. We should not be spending scarce Project resources on improving that code, especially given the lack of strong demand for Gopher support. With this change, Gopher requests will be handled like any other request with an unknown (to Squid) protocol. For example, HTTP requests with Gopher URI scheme result in ERR_UNSUP_REQ. Default Squid configuration still considers TCP port 70 "safe". The corresponding Safe_ports ACL rule has not been removed for consistency sake: We consider WAIS port safe even though Squid refuses to forward WAIS requests: acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais
squid-cache · Jul 27, 2022 · 6ea12e8 · 6ea12e8
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diff --git a/doc/Programming-Guide/Groups.dox b/doc/Programming-Guide/Groups.dox
@@ -31,11 +31,6 @@
  *   caches.
  *   All requests to other proxies are sent as HTTP requests.
  *   All requests to origin-server are sent in that servers protocol.
- *
- \par
- *   Wais and Gopher don't receive much
- *   attention because they comprise a relatively insignificant
- *   portion of Internet traffic.
  */
 
 /**

diff --git a/doc/debug-sections.txt b/doc/debug-sections.txt
@@ -27,7 +27,6 @@ section 06    Disk I/O Routines
 section 07    Multicast
 section 08    Swap File Bitmap
 section 09    File Transfer Protocol (FTP)
-section 10    Gopher
 section 11    Hypertext Transfer Protocol (HTTP)
 section 12    Internet Cache Protocol (ICP)
 section 13    High Level Memory Pool Management

diff --git a/doc/manuals/de.po b/doc/manuals/de.po
@@ -3868,7 +3868,7 @@ msgid ""
 "blocking process."
 msgstr ""
 "B<squid> ist ein leistungsfähiger Proxy caching Server für Web Clients, "
-"welcher FTP, gopher, ICAP, ICP, HTCP and HTTP Data Objects unterstützt. Im "
+"welcher FTP, ICAP, ICP, HTCP and HTTP Data Objects unterstützt. Im "
 "Unterschied zu traditioneller caching Software verarbeitet B<squid> alle "
 "Anfragen in einem einzigen non-blocking Prozess."
 

diff --git a/doc/manuals/en.po b/doc/manuals/en.po
@@ -4262,7 +4262,7 @@ msgid ""
 "blocking process."
 msgstr ""
 "B<squid> is a high-performance proxy caching server for web clients, "
-"supporting FTP, gopher, ICAP, ICP, HTCP and HTTP data objects.  Unlike "
+"supporting FTP, ICAP, ICP, HTCP and HTTP data objects.  Unlike "
 "traditional caching software, Squid handles all requests in a single, non-"
 "blocking process."
 

diff --git a/doc/manuals/en_AU.po b/doc/manuals/en_AU.po
@@ -4060,7 +4060,7 @@ msgid ""
 "blocking process."
 msgstr ""
 "B<squid> is a high-performance proxy caching server for web clients, "
-"supporting FTP, gopher, ICAP, ICP, HTCP and HTTP data objects.  Unlike "
+"supporting FTP, ICAP, ICP, HTCP and HTTP data objects.  Unlike "
 "traditional caching software, Squid handles all requests in a single, non-"
 "blocking process."
 

diff --git a/doc/manuals/es.po b/doc/manuals/es.po
@@ -2562,7 +2562,7 @@ msgid ""
 "blocking process."
 msgstr ""
 "B<squid> es servidor proxy-caché de alto rendimiento para clientes web que "
-"soporta FTP, gopher, ICAP, ICP, HTCP y objetos de datos HTTP. A diferencia "
+"soporta FTP, ICAP, ICP, HTCP y objetos de datos HTTP. A diferencia "
 "del software de caché tradicional, Squid maneja todas las solicitudes en un "
 "único proceso asíncrono"
 

diff --git a/doc/manuals/fr.po b/doc/manuals/fr.po
@@ -1495,7 +1495,7 @@ msgid ""
 "non-blocking process."
 msgstr ""
 "B<squid> est un serveur proxy de haute performance cachant les clients sur "
-"le web, il supporte les protocoles FTP, Gopher, ICAP, ICP, HTCP et HTTP pour "
+"le web, il supporte les protocoles FTP, ICAP, ICP, HTCP et HTTP pour "
 "le transfert des données. Contrairement aux logiciels de mise en cache "
 "traditionnelle, Squid gère toutes les requêtes en un seul processus non-"
 "bloquant."

diff --git a/doc/manuals/it.po b/doc/manuals/it.po
@@ -1485,7 +1485,7 @@ msgid ""
 "non-blocking process."
 msgstr ""
 "B<squid> è un server proxy con cache ad alte prestazioni per client WWW, con "
-"supporto supporta i protocolli FTP, gopher, ICAP, ICP, HTCP e HTTP. A "
+"supporto supporta i protocolli FTP, ICAP, ICP, HTCP e HTTP. A "
 "differenza di altri software, Squid gestisce tutte operazioni all'interno di "
 "un singolo processo con I/O non bloccante."
 

diff --git a/errors/af.po b/errors/af.po
@@ -809,17 +809,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid ondersteun nie alle navraagmetodes vir alle toegangsprotokolle nie. "
-"Mens kan by voorbeeld nie 'n Gopher-navraag POST nie."
+"Squid ondersteun nie alle navraagmetodes vir alle toegangsprotokolle nie."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid ondersteun nie alle navraagmetodes vir alle toegangsprotokolle nie. "
-"Mens kan by voorbeeld nie 'n Gopher-navraag POST nie."
+"Squid ondersteun nie alle navraagmetodes vir alle toegangsprotokolle nie."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/az.po b/errors/az.po
@@ -836,17 +836,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid bütün sorğu metodları və bütün protokollardəstəkləmir. Məsələn, Gopher "
-"protokolu üzrə siz POST sorğu metodunu yerinə yetirə bilməzsiniz."
+"Squid bütün sorğu metodları və bütün protokollardəstəkləmir."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid bütün sorğu metodları və bütün protokollardəstəkləmir. Məsələn, Gopher "
-"protokolu üzrə siz POST sorğu metodunu yerinə yetirə bilməzsiniz."
+"Squid bütün sorğu metodları və bütün protokollardəstəkləmir."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 #, fuzzy

diff --git a/errors/bg.po b/errors/bg.po
@@ -840,17 +840,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Кеш сървърът не поддържа всички методи на заявка за всички протоколи. "
-"Например, не можете да заявите метод POST за протокол Gopher."
+"Кеш сървърът не поддържа всички методи на заявка за всички протоколи."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Кеш сървърът не поддържа всички методи на заявка за всички протоколи. "
-"Например, не можете да заявите метод POST за протокол Gopher."
+"Кеш сървърът не поддържа всички методи на заявка за всички протоколи."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/ca.po b/errors/ca.po
@@ -834,8 +834,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "La <i>cache</i> no admet tots els tipus de petici&oacute; per a tots els "
-"protocols. Per exemple, no es pot fer una petici&oacute; tipus POST en el "
-"protocol Gopher."
+"protocols."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -844,8 +843,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "La <i>cache</i> no admet tots els tipus de petici&oacute; per a tots els "
-"protocols. Per exemple, no es pot fer una petici&oacute; tipus POST en el "
-"protocol Gopher."
+"protocols."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 #, fuzzy

diff --git a/errors/cs.po b/errors/cs.po
@@ -831,17 +831,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid nepodporuje všechny typy metod u všech protokolů. Např. není možno "
-"použit metodu POST u služby GOPHER."
+"Squid nepodporuje všechny typy metod u všech protokolů."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid nepodporuje všechny typy metod u všech protokolů. Např. není možno "
-"použit metodu POST u služby GOPHER."
+"Squid nepodporuje všechny typy metod u všech protokolů."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/da.po b/errors/da.po
@@ -829,8 +829,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Proxy'en Squid underst&oslash;tter ikke alle foresp&oslash;rgselsmetoder for "
-"alle adgangs protokoller. For eksempel kan du ikke POST en Gopher "
-"foresp&oslash;rgsel."
+"alle adgangs protokoller."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -839,8 +838,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "Proxy'en Squid underst&oslash;tter ikke alle foresp&oslash;rgselsmetoder for "
-"alle adgangs protokoller. For eksempel kan du ikke POST en Gopher "
-"foresp&oslash;rgsel."
+"alle adgangs protokoller."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/de.po b/errors/de.po
@@ -832,17 +832,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid unterstützt nicht alle Anfragemethoden für alle Protokolle. Sie können "
-"zum Beispiel keine POST Anfrage über das Gopher Protokoll senden."
+"Squid unterstützt nicht alle Anfragemethoden für alle Protokolle."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid unterstützt nicht alle Anfragemethoden für alle Protokolle. Sie können "
-"zum Beispiel keine POST Anfrage über das Gopher Protokoll senden."
+"Squid unterstützt nicht alle Anfragemethoden für alle Protokolle."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/el.po b/errors/el.po
@@ -843,7 +843,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Το Squid δεν υποστηρίζει όλες τις μεθόδους αιτήσεων για όλα τα πρωτόκολλα "
-"πρόσβασης. Για παράδειγμα, το POST για Gopher δεν υποστηρίζεται."
+"πρόσβασης."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -852,7 +852,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "Το Squid δεν υποστηρίζει όλες τις μεθόδους αιτήσεων για όλα τα πρωτόκολλα "
-"πρόσβασης. Για παράδειγμα, το POST για Gopher δεν υποστηρίζεται."
+"πρόσβασης."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/en.po b/errors/en.po
@@ -832,17 +832,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid does not support all request methods for all access protocols. For "
-"example, you can not POST a Gopher request."
+"Squid does not support all request methods for all access protocols."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid does not support all request methods for all access protocols. For "
-"example, you can not POST a Gopher request."
+"Squid does not support all request methods for all access protocols."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/errorpage.css b/errors/errorpage.css
@@ -73,7 +73,7 @@ p {
 pre {
 }
 
-/* special event: FTP / Gopher directory listing */
+/* special event: FTP directory listing */
 #dirmsg {
     font-family: courier, monospace;
     color: black;

diff --git a/errors/es-mx.po b/errors/es-mx.po
@@ -843,8 +843,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Squid no soporta todos los métodos de solicitud para algunos protocolos de "
-"acceso. Por ejemplo, no es posible hacer una solcitud POST a un servidor "
-"Gopher."
+"acceso."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 msgid ""

diff --git a/errors/es.po b/errors/es.po
@@ -850,7 +850,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Squid no admite todos los m&eacute;todos para todos los protocolos de "
-"acceso. Por ejemplo, no se puede hacer un POST a un servidor Gopher."
+"acceso."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -859,7 +859,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "Squid no admite todos los m&eacute;todos para todos los protocolos de "
-"acceso. Por ejemplo, no se puede hacer un POST a un servidor Gopher."
+"acceso."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/et.po b/errors/et.po
@@ -838,8 +838,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Squid ei toeta k&otilde;iki p&auml;ringu meetodeid k&otilde;ikide "
-"protokollidega. N&auml;iteks, te ei saa teha POST operatsiooni Gopher p&auml;"
-"ringus."
+"protokollidega."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -848,8 +847,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "Squid ei toeta k&otilde;iki p&auml;ringu meetodeid k&otilde;ikide "
-"protokollidega. N&auml;iteks, te ei saa teha POST operatsiooni Gopher p&auml;"
-"ringus."
+"protokollidega."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/fi.po b/errors/fi.po
@@ -823,17 +823,16 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"Squid ei tue kaikkia hakupyynnon tyyppejä kaikilla protokollilla. Et voi "
-"esimerkiksi käyttää POST-pyyntöä gopherilla."
+"Squid ei tue kaikkia hakupyynnon tyyppejä kaikilla protokollilla."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"Squid ei tue kaikkia hakupyynnon tyyppejä kaikilla protokollilla. Et voi "
-"esimerkiksi käyttää POST-pyyntöä gopherilla."
+"Squid ei tue kaikkia pääsyprotokollia. Esimerkiksi SSH-protokolla "
+"ei ole tällä hetkellä tuettu."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/fr.po b/errors/fr.po
@@ -852,8 +852,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "Squid ne prend pas en charge tous les types de requêtes par rapport à tous "
-"les protocoles d'accès. Vous ne pouvez pas par exemple utiliser une requête "
-"POST avec le protocole Gopher."
+"les protocoles d'accès."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -862,8 +861,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "Squid ne prend pas en charge tous les types de requêtes par rapport à tous "
-"les protocoles d'accès. Vous ne pouvez pas par exemple utiliser une requête "
-"POST avec le protocole Gopher."
+"les protocoles d'accès."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/he.po b/errors/he.po
@@ -827,17 +827,15 @@ msgid ""
 "Squid does not support all request methods for all access protocols. For "
 "example, you can not POST a Gopher request."
 msgstr ""
-"שרת ה Squid אינו תומך בכל שיטות הבקשה לכל הפרוטוקולים. לדוגמא אינך יכול "
-"לשלוח בקשת POST ב-Gopher."
+"שרת ה Squid אינו תומך בכל שיטות הבקשה לכל הפרוטוקולים."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
 msgid ""
 "Squid does not support some access protocols. For example, the SSH protocol "
 "is currently not supported."
 msgstr ""
-"שרת ה Squid אינו תומך בכל שיטות הבקשה לכל הפרוטוקולים. לדוגמא אינך יכול "
-"לשלוח בקשת POST ב-Gopher."
+"שרת ה Squid אינו תומך בכל שיטות הבקשה לכל הפרוטוקולים."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""

diff --git a/errors/hu.po b/errors/hu.po
@@ -836,8 +836,7 @@ msgid ""
 "example, you can not POST a Gopher request."
 msgstr ""
 "A proxyszerver nem támogat minden létező kéréstípus és protokoll "
-"kombinációt, így pl. nem lehet POST kéréstípust használni egy Gopher "
-"kérésben."
+"kombinációt."
 
 #: templates/ERR_PROTOCOL_UNKNOWN+html.body.div.p:27-1
 #, fuzzy
@@ -846,8 +845,7 @@ msgid ""
 "is currently not supported."
 msgstr ""
 "A proxyszerver nem támogat minden létező kéréstípus és protokoll "
-"kombinációt, így pl. nem lehet POST kéréstípust használni egy Gopher "
-"kérésben."
+"kombinációt."
 
 #: templates/ERR_LIFETIME_EXP+html.body.div.p:27-1
 msgid ""