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Gopher (protocol)
The Gopher protocol /
ˈɡoʊfər
/ is a communication protocol designed for distributing, searching, and retrieving documents in Internet Protocol networks. The design of the Gopher protocol and user interface is menu-driven, and presented an alternative to the World Wide Web in its early stages, but ultimately fell into disfavor, yielding to HTTP. The Gopher ecosystem is often regarded as the effective predecessor of the World Wide Web.[1][2]
The protocol was invented by a team led by Mark P. McCahill[3] at the University of Minnesota. It offers some features not natively supported by the Web and imposes a much stronger hierarchy on the documents it stores. Its text menu interface is well-suited to computing environments that rely heavily on remote text-oriented computer terminals, which were still common at the time of its creation in 1991, and the simplicity of its protocol facilitated a wide variety of client implementations. More recent[when?] Gopher revisions and graphical clients added support for multimedia.[citation needed]
Gopher's hierarchical structure provided a platform for the first large-scale electronic library connections.[4] The Gopher protocol is still in use by enthusiasts, and although it has been almost entirely supplanted by the Web, a small population of actively-maintained servers remains.[2]
Origins
Gopher system was released in mid-1991 by Mark P. McCahill, Farhad Anklesaria, Paul Lindner, Daniel Torrey, and Bob Alberti of the University of Minnesota in the United States.[5] Its central goals were, as stated in RFC 1436:
Gopher combines document hierarchies with collections of services, including WAIS, the Archie and Veronica search engines, and gateways to other information systems such as File Transfer Protocol (FTP) and Usenet.
The general interest in campus-wide information systems (CWISs) in higher education at the time,[6] and the ease of setup of Gopher servers to create an instant CWIS with links to other sites' online directories and resources were the factors contributing to Gopher's rapid adoption.
The name was coined by Anklesaria as a play on several meanings of the word "gopher".[7] The University of Minnesota mascot is the gopher,[8] a gofer is an assistant who "goes for" things, and a gopher burrows through the ground to reach a desired location.[9]
Decline
The World Wide Web was in its infancy in 1991, and Gopher services quickly became established. By the late 1990s, Gopher had ceased expanding. Several factors contributed to Gopher's stagnation:
Gopher remains in active use by its enthusiasts, and there have been attempts to revive Gopher on modern platforms and mobile devices. One attempt is The Overbite Project,[15] which hosts various browser extensions and modern clients.
Server census
Technical details
The conceptualization of knowledge in "Gopher space" or a "cloud" as specific information in a particular file, and the prominence of the FTP, influenced the technology and the resulting functionality of Gopher.
Gopher characteristics
Gopher is designed to function and to appear much like a mountable read-only global network file system (and software, such as gopherfs, is available that can actually mount a Gopher server as a FUSE resource). At a minimum, whatever can be done with data files on a CD-ROM, can be done on Gopher.
A Gopher system consists of a series of hierarchical hyperlinkable menus. The choice of menu items and titles is controlled by the administrator of the server.

The top level menu of a Gopher server. Selecting the "Fun and Games" menu item...

...takes the user to the "Fun and Games" menu.
Similar to a file on a Web server, a file on a Gopher server can be linked to as a menu item from any other Gopher server. Many servers take advantage of this inter-server linking to provide a directory of other servers that the user can access.
Protocol
The Gopher protocol was first described in RFC 1436. IANA has assigned TCP port 70 to the Gopher protocol.
The protocol is simple to negotiate, making it possible to browse without using a client. A standard gopher session may therefore appear as follows:
/Reference 1CIA World Factbook /Archives/mirrors/textfiles.com/politics/CIA gopher.quux.org 70 0Jargon 4.2.0 /Reference/Jargon 4.2.0 gopher.quux.org 70 + 1Online Libraries /Reference/Online Libraries gopher.quux.org 70 + 1RFCs: Internet Standards /Computers/Standards and Specs/RFC gopher.quux.org 70 1U.S. Gazetteer /Reference/U.S. Gazetteer gopher.quux.org 70 + iThis file contains information on United States fake (NULL) 0 icities, counties, and geographical areas. It has fake (NULL) 0 ilatitude/longitude, population, land and water area, fake (NULL) 0 iand ZIP codes. fake (NULL) 0 i fake (NULL) 0 iTo search for a city, enter the city's name. To search fake (NULL) 0 ifor a county, use the name plus County -- for instance, fake (NULL) 0 iDallas County. fake (NULL) 0
Here, the client has established a TCP connection with the server on port 70, the standard gopher port. The client then sends a string followed by a carriage return followed by a line feed (a "CR + LF" sequence). This is the selector, which identifies the document to be retrieved. If the item selector were an empty line, the default directory would be selected. The server then replies with the requested item and closes the connection. According to the protocol, before the connection is closed, the server should send a full-stop (i.e., a period character) on a line by itself. However, as is the case here, not all servers conform to this part of the protocol and the server may close the connection without returning the final full-stop.
In this example, the item sent back is a gopher menu, a directory consisting of a sequence of lines each of which describes an item that can be retrieved. Most clients will display these as hypertext links, and so allow the user to navigate through gopherspace by following the links.[5]
All lines in a gopher menu are terminated by "CR + LF", and consist of five fields: the item type as the very first character (see below), the display string (i.e., the description text to display), a selector (i.e., a file-system pathname), host name (i.e., the domain name of the server on which the item resides), and port (i.e., the port number used by that server). The item type and display string are joined without a space; the other fields are separated by the tab character.
Because of the simplicity of the Gopher protocol, tools such as netcat make it possible to download Gopher content easily from the command line:
echo jacks/jack.exe | nc gopher.example.org 70 > jack.exe
The protocol is also supported by cURL as of 7.21.2-DEV.[21]
Search request
The selector string in the request can optionally be followed by a tab character and a search string. This is used by item type 7.
Source code of a menu
Gopher menu items are defined by lines of tab-separated values in a text file. This file is sometimes called a gophermap. As the source code to a gopher menu, a gophermap is roughly analogous to an HTML file for a web page. Each tab-separated line (called a selector line) gives the client software a description of the menu item: what it is, what it's called, and where it leads. The client displays the menu items in the order that they appear in the gophermap.
The first character in a selector line indicates the item type, which tells the client what kind of file or protocol the menu item points to. This helps the client decide what to do with it. Gopher's item types are a more basic precursor to the media type system used by the Web and email attachments.
The item type is followed by the user display string (a description or label that represents the item in the menu); the selector (a path or other string for the resource on the server); the hostname (the domain name or IP address of the server), and the network port.
For example: The following selector line generates a link to the "/home" directory at the subdomain gopher.floodgap.com, on port 70. The item type of 1 indicates that the resource is a Gopher menu. The string "Floodgap Home" is what the user sees in the menu.
1Floodgap Home /home gopher.floodgap.com 70
Item typeUser display stringSelectorHostnamePort
1Floodgap Home/homegopher.floodgap.com70
Item types
In a Gopher menu's source code, a one-character code indicates what kind of content the client should expect. This code may either be a digit or a letter of the alphabet; letters are case-sensitive.
The technical specification for Gopher, RFC 1436, defines 14 item types. A one-character code indicates what kind of content the client should expect. Item type 3 is an error code for exception handling. Gopher client authors improvised item types h (HTML), i (informational message), and s (sound file) after the publication of RFC 1436. Browsers like Netscape Navigator and early versions of Microsoft Internet Explorer would prepend the item type code to the selector as described in RFC 4266, so that the type of the gopher item could be determined by the url itself. Most gopher browsers still available, use these prefixes in their urls.
Canonical types
0Text file
1Gopher submenu
2CCSO Nameserver
3Error code returned by a Gopher server to indicate failure
4BinHex-encoded file (primarily for Macintosh computers)
5DOS file
6uuencoded file
7Gopher full-text search
8Telnet
9Binary file
+Mirror or alternate server (for load balancing or in case of primary server downtime)
gGIF file
IImage file
TTelnet 3270
Non-canonical types
dDoc. Seen used alongside PDF's and .DOC's
hHTML file
iInformational message
sSound file (especially the WAV format)
f F A B C D E G H J K L MG6 related types
URL links
Historically, to create a link to a Web server, "GET /" was used as a pseudo-selector to emulate an HTTP GET request. John Goerzen created an addition[22] to the Gopher protocol, commonly referred to as "URL links", that allows links to any protocol that supports URLs. For example, to create a link to http://gopher.quux.org/​, the item type is h, the display string is the title of the link, the item selector is "URL:http://gopher.quux.org/", and the domain and port are that of the originating Gopher server (so that clients that do not support URL links will query the server and receive an HTML redirection page).
Related technology
The master Gopherspace search engine is Veronica. Veronica offers a keyword search of all the public Internet Gopher server menu titles. A Veronica search produces a menu of Gopher items, each of which is a direct pointer to a Gopher data source. Individual Gopher servers may also use localized search engines specific to their content such as Jughead and Jugtail.
GopherVR is a 3D virtual reality variant of the original Gopher system.
Client software
Web browsers
BrowserVersionNotes
First supportedLast supported
ACID0.777
(April 2020)
PresentGopher-only browser for Windows, page cache, TFTP, G6 gopher protocol support
Browse?PresentThis browser is for RISC OS
Camino1.02.1.2Always uses port 70.
Classilla9.0PresentHardcoded to port 70 from 9.0 to 9.2; whitelisted ports from 9.2.1
cURL7.21.2
(October 2010)
PresentcURL is a command-line file transfer utility
Dooble1.53Present
ELinks0.10.0[23]?Offers support as a build option
Epiphany?2.26.3Disabled after switch to WebKit
Falkon3.1.0,
with plug-in only
Present,
with plug-in only
Requires Falkon ≥ 3.1.0 with both the KDE Frameworks Integration extension (shipped with Falkon ≥ 3.1.0) enabled and the (separate) kio_gopher plug-in[24] ≥ 0.1.99 (first release for KDE Frameworks 5) installed
Galeon?2.0.7
Google ChromeWith extension only[25]N/AWith Burrow extension[26]
Gophie1.0
(April 2020)
Present-
Internet ExplorerN/A6Support removed by MS02-047 from IE 6 SP1 can be re-enabled in the Windows Registry.[27] Always uses port 70.
Internet Explorer for Mac?5.2.3PowerPC-only
K-Meleon?Present
KonquerorWith plug-in only?Requires kio_gopher plug-in[24]
Lagrange0.8PresentLagrange is a graphical gemini client that offers gopher and finger support.
libwww1.0c
(December 1992)
Presentlibwww is an API for internet applications
Line Mode BrowserPresent
Lynx?Present
Mosaic?Present (3.0)
Mozilla Firefox0.03.6Built-in support dropped from Firefox 4.0 onwards;[28] can be added back by installing one of the extensions by the Overbite Project[15]
Netscape Navigator?9.0.0.6
NetSurfN/AN/AUnder development, based on the cURL fetcher
OmniWeb5.9.2PresentFirst WebKit Browser to support Gopher[29][30]
OperaN/AN/AOpera 9.0 includes a proxy capability
Pavuk?PresentPavuk is a web mirror (recursive download) software program
SeaMonkey1.02.0.14Built-in support dropped from SeaMonkey 2.1 onwards; can be added back by installing one of the extensions by the Overbite Project[15]
WebPositive?PresentWebKit-based browser used in the Haiku operating system
Browsers that do not natively support Gopher can still access servers using one of the available Gopher to HTTP gateways.
Gopher support was disabled in Internet Explorer versions 5.x and 6 for Windows in August 2002 by a patch meant to fix a security vulnerability in the browser's Gopher protocol handler to reduce the attack surface which was included in IE6 SP1; however, it can be re-enabled by editing the Windows registry. In Internet Explorer 7, Gopher support was removed on the WinINET level.[31]
Gopher browser extensions
For Mozilla Firefox and SeaMonkey, Overbite[15] extensions extend Gopher browsing and support the current versions of the browsers (Firefox Quantum v ≥57 and equivalent versions of SeaMonkey):
OverbiteWX includes support for accessing Gopher servers not on port 70 using a whitelist and for CSO/ph queries. OverbiteFF always uses port 70.
For Chromium and Google Chrome, Burrow[26] is available. It redirects gopher:// URLs to a proxy. In the past an Overbite proxy-based extension for these browsers was available but is no longer maintained and does not work with the current (>23) releases.[15]
For Konqueror, Kio gopher[32] is available.
Gopher clients for mobile devices
Some[who?] have suggested that the bandwidth-sparing simple interface of Gopher would be a good match for mobile phones and personal digital assistants (PDAs),[33] but so far, mobile adaptations of HTML and XML and other simplified content have proven more popular. The PyGopherd server provides a built-in WML front-end to Gopher sites served with it.
The early 2010s saw a renewed interest in native Gopher clients for popular smartphones: Overbite, an open source client for Android 1.5+ was released in alpha stage in 2010.[34] PocketGopher was also released in 2010, along with its source code, for several Java ME compatible devices. Gopher Client was released in 2016 as a proprietary client for iPhone and iPad devices and is currently maintained.[35]
Other Gopher clients
Gopher popularity was at its height at a time when there were still many equally competing computer architectures and operating systems. As a result, there are several Gopher clients available for Acorn RISC OS, AmigaOS, Atari MiNT, CMS, DOS, classic Mac OS, MVS, NeXT, OS/2 Warp, most UNIX-like operating systems, VMS, Windows 3.x, and Windows 9x. GopherVR was a client designed for 3D visualization, and there is even a Gopher client in MOO.[36][37] The majority of these clients are hard-coded to work on TCP port 70.
Gopher over HTTP gateways
Users of Web browsers that have incomplete or no support for Gopher can access content on Gopher servers via a server gateway or proxy server that converts Gopher menus into HTML; known proxies are the Floodgap Public Gopher proxy and Gopher Proxy. Similarly, certain server packages such as GN and PyGopherd have built-in Gopher to HTTP interfaces. Squid Proxy software gateways any gopher:// URL to HTTP content, enabling any browser or web agent to access gopher content easily.
Server software
Because the protocol is trivial to implement in a basic fashion, there are many server packages still available, and some are still maintained.
ServerDeveloped byLatest versionRelease dateLicenseWritten inNotes
AftershockRob Linwood1.0.122 April 2004MITJava
Apache::GopherHandlerTimm Murray0.126 March 2004GPLv2 or any later versionPerlApache 2 plugin to run Gopher-Server.
AtuaCharles Childers2017.49 October 2017ISCForth
BucktoothCameron Kaiser0.2.91 May 2011Floodgap Free Software LicensePerl
Flask-GopherMichael Lazar2.2.111 April 2020GPLv3Python
geomyidQuinn Evans0.0.110 August 20152-clause BSDCommon Lisp
geomyidae (gopher link) (proxied link)Christoph Lohmann0.3413 March 2019MITC
GNxripclaw2.25-2002022626 February 2002GPLC
GoFishSean MacLennan1.28 October 2010GPLv2C
Gopher Cannon[dead link]Geoff Sevart1.078 July 2013Freeware.NET 3.5 (Win32/Win64)Version 1.06 of 26 August 2010 is available from gopherspace.de (gopher link) (proxied link)
Gopher-ServerTimm Murray0.1.126 March 2004GPLv2Perl
GophernicusKim Holviala and others3.1.13 January 20212-clause BSDC
gophrierGuillaume Duhamel0.2.329 March 2012GPLv2C
GOPHSERV[dead link]?0.530 December 2012GPLv3FreeBASICVersion 0.4 is available from gopherspace.de (gopher link) (proxied link)
GoscherAaron W. Hsu8.020 June 2011ISCScheme
mgodMate Nagy1.129 January 2018GPLv3C
MotsognirMateusz Viste1.0.138 January 2021MITC
Pituophisdotcomboom1.116 May 20202-clause BSDPythonPython-based Gopher library with both server and client support
PyGopherdJohn Goerzen2.0.18.514 February 2017GPLv2Python
PyGSAdam Gurno0.3.57 August 2001GPLv2PythonDevelopment stopped as of 17 April 2003
RedisSalvatore Sanfilippo6.2.41 June 20213-clause BSDC
save_gopher_serverSSS85550.7777 July 2020?Perlwith G6 extension and TFTP
SpacecookieLukas Epple1.0.0.017 March 2021GPLv3Haskell
XylopharNathaniel Leveck0.0.115 January 2020GPLv3FreeBASIC
See also
References
  1. ^ Carlson, Scott (5 September 2016). "How Gopher Nearly Won the Internet". Chronicle of Higher Education. Retrieved 12 September 2016.
  2. ^ a b "How Moore's Law saved us from the Gopher web". 12 March 2009. Archived from the original on 31 August 2011. Retrieved 20 September 2011.
  3. ^ Mark P. McCahill interviewed on the TV show Triangulation on the TWiT.tv network
  4. ^ Suzan D. McGinnis (2001). Electronic collection management. Routledge. pp. 69–72. ISBN 0-7890-1309-6.
  5. ^ a b December, John; Randall, Neil (1994). The World Wide Web unleashed. Sams Publishing. p. 20. ISBN 1-57521-040-1.
  6. ^ "Google Groups archive of bit.listserv.cwis-l discussion". Retrieved 27 July 2011.
  7. ^ Mark McCahill, Farhad Anklesaria. "Smart Solutions: Internet Gopher" (Flash). Minneapolis: University of Minnesota Media Mill. Event occurs at 2:40. Archived from the original on 20 July 2011. McCahill credits Anklesaria with naming Gopher
  8. ^ "Gophersports.com – Official Web Site of University of Minnesota Athletics". Archived from the original on 14 August 2010. Retrieved 17 August 2010.
  9. ^ a b Gihring, Tim. "The rise and fall of the Gopher protocol". minnpost.com. Retrieved 12 August 2016.
  10. ^ "Subject: University of Minnesota Gopher software licensing policy". Funet.fi. Retrieved 12 August 2015.
  11. ^ JQ Johnson (25 February 1993). "Message from discussion gopher licensing". Retrieved 27 July 2011.
  12. ^ Joel Rubin (3 March 1999). "CW from the VOA server page – rec.radio.shortwave". Retrieved 27 July 2011.
  13. ^ Johan Söderberg (2007). Hacking Capitalism: The Free and Open Source Software Movement. Routledge. p. 25. ISBN 978-0-415-95543-0.
  14. ^ "Google Groups". Retrieved 12 August 2015.
  15. ^ a b c d e "The Overbite Project". Floodgap. Retrieved 25 July 2010.
  16. ^ a b c d e f g h "Floodgap Gopher-HTTP gateway gopher://gopher/0/v2/vstat"​. Gopher.floodgap.com. Retrieved 5 January 2017.
  17. ^ Kaiser, Cameron (19 March 2007). "Down the Gopher Hole". TidBITS. Retrieved 23 March 2007.
  18. ^ http://gopher.floodgap.com/1/new Archived 4 August 2011 at the Wayback Machine
  19. ^ "Download A Piece of Internet History". The Changelog. 28 April 2010. Archived from the original on 23 July 2011. Retrieved 27 July 2011.
  20. ^ "Release Notes – OmniWeb 5 – Products". The Omni Group. Archived from the original on 7 August 2011. Retrieved 27 July 2011. OmniWeb 5.9.2 Released 1 April 2009: Implemented ground-breaking support for the revolutionary Gopher protocol—a first for WebKit-based browsers! For a list of Gopher servers, see the Floodgap list. Enjoy!. The same text appears in the 5.10 release of 27 August 2009 further down the page, copied from the 5.9.2 unstable branch. The Floodgap list referred to is at Floodgap: new Gopher servers and does not itself refer to April Fools' Day.
  21. ^ "Curl: Re: Gopher patches for cURL (includes test suite)". Archived from the original on 21 April 2019. Retrieved 9 March 2020.
  22. ^ "Gopher: gopher.2002-02". Gopher.quux.org. Retrieved 12 August 2015.
  23. ^ Fonseca, Jonas (24 December 2004). "elinks-users ANNOUNCE ELinks-0.10.0 (Thelma)". Linux From Scratch. Archived from the original on 20 February 2007. Retrieved 22 May 2010.
  24. ^ a b "Kio gopher - KDE UserBase Wiki". userbase.kde.org. Archived from the original on 1 May 2018. Retrieved 1 May 2018.
  25. ^ hotaru.firefly; et al. (2 May 2009). "Issue 11345: gopher protocol doesn't work". Retrieved 25 July 2011.
  26. ^ a b "Burrow: Gopherspace Explorer for Chrome". Retrieved 1 July 2019.
  27. ^ "Microsoft Security Bulletin MS02-047". Microsoft. 28 February 2003. Archived from the original on 4 July 2011. Retrieved 23 March 2007.
  28. ^ "Bug 388195 – Remove gopher protocol support for Firefox". Retrieved 15 June 2010.
  29. ^ Sharps, Linda (1 April 2009). "OmniWeb 5.9.2 now includes Gopher support". The Omni Group. Archived from the original on 14 August 2011. Retrieved 3 April 2009.
  30. ^ "A comprehensive list of changes for each version of OmniWeb". The Omni Group. 1 April 2009. Archived from the original on 7 August 2011. Retrieved 3 April 2009.
  31. ^ "Release Notes for Internet Explorer 7". Microsoft. 2006. Archived from the original on 4 August 2011. Retrieved 23 March 2007.
  32. ^ "Kio gopher". Retrieved 1 April 2017.
  33. ^ Lore Sjöberg (12 April 2004). "Gopher: Underground Technology". Wired News. Archived from the original on 12 October 2008. Retrieved 27 July 2011.
  34. ^ Paul, Ryan (6 July 2010). "Overbite Project brings Gopher protocol to Android". Ars Technica. Retrieved 25 July 2010.
  35. ^ https://itunes.apple.com/us/app/gopher-client/id1235310088
  36. ^ Riddle, Prentiss (13 April 1993). "GopherCon '93: Internet Gopher Workshop and Internet Gopher Conference". PrentissRiddle.com. Retrieved 20 May 2008.
  37. ^ Masinter, Larry (1993). "Collaborative information retrieval: Gopher from MOO". CiteSeerX 10.1.1.198.5779.
External links
Last edited on 1 June 2021, at 15:06
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