SWI-Prolog HTTP support library
This directory provides the SWI-Prolog libraries for accessing and providing HTTP services.
Client library
The main client library is library(http/http_open), which can open
both HTTP and HTTPS connections and handle all request methods.
Server library
The main server libraris are
library(http/thread_httpd)implements the serverlibrary(http/http_dispatch)implements binding locations predicateslibrary(http/http_unix_daemon)implements integration in various Unix server managers and in general provides a suitable entry point for HTTP servers on Unix.library(http/html_write)implements generating HTMLlibrary(http/http_json)implements reading and writing JSON documents.
For simplicity, you can use library(http/http_server), which
combines the typical HTTP libraries that most servers need. The
idea of a common request handling system and three controlling
libraries is outdated; the threaded server now being the only sensible
controlling library.
Requirements
This library uses functionality from the ssl package to support HTTPS,
the sgml package to read XML/HTML and the clib package for various
extensions.
Prolog files
ax.pl -- Attribute Exchange library | ||
|---|---|---|
| ax_alias/2 | True when Alias is an alias name for the AX schema URL. | |
| ax_form_attributes/2 | True if Values is a list Alias(Value) for each exchanged attribute. | |
| http_ax_attributes/2 | True when HTTPAttributes is a list of Name=Value pairs that can be used with an HTTP request to query for the attributes Spec. | |
| html_head.pl -- Automatic inclusion of CSS and scripts links | ||
| html_current_resource/1 | True when About is a currently known resource. | |
| html_requires/3 | Include ResourceOrList and all dependencies derived from it and add them to the HTML head using html_post/2. | |
| html_resource/2 | Register an HTML head resource. | |
| mime_include/4 | Hook called to include a link to an HTML resource of type Mime into the HTML head. | |
| html_quasiquotations.pl -- HTML quasi quotations | ||
| html/4 | The predicate html/4 implements HTML quasi quotations. | |
| html_write.pl -- Write HTML text | ||
| html/3 | Generate HTML from Content. | |
| html_begin/3 | For html_begin//1, Env is a term Env(Attributes); for html_end//1 it is the plain environment name. | |
| html_current_option/1 | True if Option is an active option for the HTML generator. | |
| html_end/3 | For html_begin//1, Env is a term Env(Attributes); for html_end//1 it is the plain environment name. | |
| html_meta/1 | This directive can be used to declare that an HTML rendering rule takes HTML content as argument. | |
| html_post/4 | Reposition HTML to the receiving Id. | |
| html_print_length/2 | Determine the content length of a token list produced using html//1. | |
| html_quoted/3 | Quote the value for normal (CDATA) text. | |
| html_quoted_attribute/3 | Quote the value according to the rules for tag-attributes included in double-quotes. | |
| html_receive/3 | Receive posted HTML tokens. | |
| html_receive/4 | This extended version of html_receive//1 causes Handler to be called to process all messages posted to the channal at the time output is generated. | |
| html_root_attribute/4 | Add an attribute to the HTML root element of the page. | |
| html_set_options/1 | Set options for the HTML output. | |
| layout/3 | Define required newlines before and after tags. | |
| page/3 | Generate a page including the HTML <!DOCTYPE> header. | |
| page/4 | Generate a page including the HTML <!DOCTYPE> header. | |
| print_html/1 | Print list of atoms and layout instructions. | |
| print_html/2 | Print list of atoms and layout instructions. | |
| reply_html_page/2 | Provide the complete reply as required by http_wrapper.pl for a page constructed from Head and Body. | |
| reply_html_page/3 | Provide the complete reply as required by http_wrapper.pl for a page constructed from Head and Body. | |
| xhtml_ns/4 | Demand an xmlns:id=Value in the outer html tag. | |
| http_authenticate.pl -- Authenticate HTTP connections using 401 headers | ||
| http_authenticate/3 | True if Request contains the information to continue according to Type. | |
| http_authorization_data/2 | Decode the HTTP Authorization header. | |
| http_current_user/3 | True when User is present in the htpasswd file File and Fields provides the additional fields. | |
| http_read_passwd_file/2 | Read a password file. | |
| http_write_passwd_file/2 | Write password data Data to File. | |
| authenticate/3 | Plugin for library(http_dispatch) to perform basic HTTP authentication. | |
| http_client.pl -- HTTP client library | ||
| post_data_hook/3 | Hook to extend the datatypes supported by the post(Data) option of http_open/3. | |
| http_convert_data/4 | Multi-file hook to convert a HTTP payload according to the Content-Type header. | |
| http_delete/3 | Execute a DELETE method on the server. | |
| http_disconnect/1 | Close down some connections. | |
| http_get/3 | Get data from a URL server and convert it to a suitable Prolog representation based on the Content-Type header and plugins. | |
| http_patch/4 | Issue an HTTP PATCH request. | |
| http_post/4 | Issue an HTTP POST request. | |
| http_put/4 | Issue an HTTP PUT request. | |
| http_read_data/3 | Read data from an HTTP connection and convert it according to the supplied to(Format) option or based on the Content-type in the Request. | |
| http_cors.pl -- Enable CORS: Cross-Origin Resource Sharing | ||
| cors_enable/0 | Emit the HTTP header Access-Control-Allow-Origin using domains from the setting http:cors. | |
| cors_enable/2 | CORS reply to a Preflight OPTIONS request. | |
| http_dirindex.pl -- HTTP directory listings | ||
| mime_type_icon/2 | Multi-file hook predicate that can be used to associate icons to files listed by http_reply_dirindex/3. | |
| directory_index/4 | Show index for a directory. | |
| http_reply_dirindex/3 | Provide a directory listing for Request, assuming it is an index for the physical directrory Dir. | |
| http_dispatch.pl -- Dispatch requests in the HTTP server | ||
| http_404/2 | Reply using an "HTTP 404 not found" page. | |
| http_current_handler/2 | True if Location is handled by Closure. | |
| http_current_handler/3 | Resolve the current handler and options to execute it. | |
| http_delete_handler/1 | Delete handler for Spec. | |
| http_dispatch/1 | Dispatch a Request using http_handler/3 registrations. | |
| http_handler/3 | Register Closure as a handler for HTTP requests. | |
| http_link_to_id/3 | HREF is a link on the local server to a handler with given ID, passing the given Parameters. | |
| http_location_by_id/2 | True when Location represents the HTTP path to which the handler with identifier ID is bound. | |
| http_redirect/3 | Redirect to a new location. | |
| http_reload_with_parameters/3 | Create a request on the current handler with replaced search parameters. | |
| http_reply_file/3 | Options is a list of. | |
| http_request_expansion/2 | Register Goal for expanding the HTTP request handler. | |
| http_safe_file/2 | True if FileSpec is considered safe. | |
| http_switch_protocol/2 | Send an "HTTP 101 Switching Protocols" reply. | |
| http_dyn_workers.pl -- Dynamically schedule HTTP workers. | ||
| schedule_workers/1 | Called if there is no immediately free worker to handle the incomming request. | |
| http_exception.pl -- Map Prolog exceptions to HTTP errors | ||
| http_header.pl -- Handling HTTP headers | ||
| http_hook.pl -- HTTP library hooks | ||
| convert_parameter/3 | Hook to execute a step in the HTTP parameter conversion process. | |
| http_connection_over_proxy/6 | Try to connect to the host Endpoint via Proxy for the purposes of retrieving the resource identified by URLParts. | |
| http_host.pl -- Obtain public server location | ||
| http_json.pl -- HTTP JSON Plugin module | ||
| post_data_hook/3 | Hook implementation that allows http_post_data/3 posting JSON objects using one of the forms below. | |
| http_convert_data/4 | Hook implementation that supports reading JSON documents. | |
| http_read_json/2 | Extract JSON data posted to this HTTP request. | |
| http_read_json/3 | Extract JSON data posted to this HTTP request. | |
| http_read_json_dict/2 | Similar to http_read_json/2,3, but by default uses the version 7 extended datatypes. | |
| http_read_json_dict/3 | Similar to http_read_json/2,3, but by default uses the version 7 extended datatypes. | |
| is_json_content_type/1 | True if ContentType is a header value (either parsed or as atom/string) that denotes a JSON value. | |
| json_type/1 | True if MediaType is a JSON media type. | |
| reply_json/1 | Formulate a JSON HTTP reply. | |
| reply_json/2 | Formulate a JSON HTTP reply. | |
| reply_json_dict/1 | As reply_json/1 and reply_json/2, but assumes the new dict based data representation. | |
| reply_json_dict/2 | As reply_json/1 and reply_json/2, but assumes the new dict based data representation. | |
| http_log.pl -- HTTP Logging module | ||
| http_log/2 | Write message from Format and Args to log-stream. | |
| http_log_close/1 | If there is a currently open HTTP logfile, close it after adding a term server(Reason, Time). | |
| http_log_stream/1 | True when Stream is a stream to the opened HTTP log file. | |
| http_logrotate/1 | Rotate the available log files. | |
| http_schedule_logrotate/2 | Schedule log rotation based on maintenance broadcasts. | |
| nolog/1 | Multifile predicate that can be defined to hide request parameters from the request logfile. | |
| nolog_post_content_type/1 | Multifile hook called with the Content-type header. | |
| password_field/1 | Multifile predicate that can be defined to hide passwords from the logfile. | |
| post_data_encoded/2 | Encode the POST body for inclusion into the HTTP log file. | |
| http_multipart_plugin.pl -- Multipart form-data plugin | ||
| http_convert_data/4 | Convert multipart/form-data messages for http_read_data/3. | |
| http_open.pl -- HTTP client library | ||
| disable_encoding_filter/1 | Do not use the Content-encoding as Transfer-encoding encoding for specific values of ContentType. | |
| http_close_keep_alive/1 | Close all keep-alive connections matching Address. | |
| http_open/3 | Open the data at the HTTP server as a Prolog stream. | |
| http_set_authorization/2 | Set user/password to supply with URLs that have URL as prefix. | |
| map_method/2 | Support additional METHOD keywords. | |
| open_hook/6 | Hook implementation that makes open_any/5 support http and https URLs for Mode == read. | |
| http_openid.pl -- OpenID consumer and server library | ||
| openid_associate/3 | Calls openid_associate/4 as. | |
| openid_associate/4 | Associate with an open-id server. | |
| openid_authenticate/4 | Succeeds if Request comes from the OpenID server and confirms that User is a verified OpenID user. | |
| openid_current_host/3 | Find current location of the server. | |
| openid_current_url/2 | Find the public URL for Request that we can make available to our identity provider. | |
| openid_grant/1 | Handle the reply from checkid_setup_server/3. | |
| openid_hook/1 | Call hook on the OpenID management library. | |
| openid_logged_in/1 | True if session is associated with OpenID. | |
| openid_login/1 | Associate the current HTTP session with OpenID. | |
| openid_login_form/4 | Create the OpenID form. | |
| openid_logout/1 | Remove the association of the current session with any OpenID. | |
| openid_server/2 | Realise the OpenID server. | |
| openid_server/3 | True if OpenIDLogin is the typed id for OpenID verified by Server. | |
| openid_user/3 | True if OpenID is a validated OpenID associated with the current session. | |
| openid_verify/2 | Handle the initial login form presented to the user by the relying party (consumer). | |
| http_parameters.pl -- Extract parameters (GET and POST) from HTTP requests | ||
| http_convert_parameter/4 | Conversion of an HTTP form value. | |
| http_convert_parameters/2 | Implements the parameter translation of http_parameters/2 or http_parameters/3. | |
| http_convert_parameters/3 | Implements the parameter translation of http_parameters/2 or http_parameters/3. | |
| http_parameters/2 | Get HTTP GET or POST form-data, applying type validation, default values, etc. | |
| http_parameters/3 | Get HTTP GET or POST form-data, applying type validation, default values, etc. | |
| http_path.pl -- Abstract specification of HTTP server locations | ||
| http_server_files.pl -- Serve files needed by modules from the server | ||
| serve_files_in_directory/2 | Serve files from the directory Alias from the path-info from Request. | |
| http_session.pl -- HTTP Session management | ||
| http_close_session/1 | Closes an HTTP session. | |
| http_current_session/2 | Enumerate the current sessions and associated data. | |
| http_in_session/1 | True if SessionId is an identifier for the current session. | |
| http_open_session/2 | Establish a new session. | |
| http_session_assert/1 | Versions of assert/1, retract/1 and retractall/1 that associate data with the current HTTP session. | |
| http_session_assert/2 | Versions of assert/1, retract/1 and retractall/1 that associate data with an explicit HTTP session. | |
| http_session_asserta/1 | Versions of assert/1, retract/1 and retractall/1 that associate data with the current HTTP session. | |
| http_session_asserta/2 | Versions of assert/1, retract/1 and retractall/1 that associate data with an explicit HTTP session. | |
| http_session_cookie/1 | Generate a random cookie that can be used by a browser to identify the current session. | |
| http_session_data/1 | True if Data is associated using http_session_assert/1 to the current HTTP session. | |
| http_session_data/2 | Versions of assert/1, retract/1 and retractall/1 that associate data with an explicit HTTP session. | |
| http_session_id/1 | True if SessionId is an identifier for the current session. | |
| http_session_option/1 | True if Option is a current option of the session system. | |
| http_session_retract/1 | Versions of assert/1, retract/1 and retractall/1 that associate data with the current HTTP session. | |
| http_session_retract/2 | Versions of assert/1, retract/1 and retractall/1 that associate data with an explicit HTTP session. | |
| http_session_retractall/1 | Versions of assert/1, retract/1 and retractall/1 that associate data with the current HTTP session. | |
| http_session_retractall/2 | Versions of assert/1, retract/1 and retractall/1 that associate data with an explicit HTTP session. | |
| http_set_session/1 | Overrule a setting for the current or specified session. | |
| http_set_session/2 | Overrule a setting for the current or specified session. | |
| http_set_session_options/1 | Set options for the session library. | |
| http_ssl_plugin.pl -- SSL plugin for HTTP libraries | ||
| http_stream.pl -- HTTP Streams | ||
| http_unix_daemon.pl -- Run SWI-Prolog HTTP server as a Unix system daemon | ||
| http_wrapper.pl -- Server processing of an HTTP request | ||
| http_current_request/1 | Returns the HTTP request currently being processed. | |
| http_peer/2 | True when PeerIP is the IP address of the connection peer. | |
| http_relative_path/2 | Convert an absolute path (without host, fragment or search) into a path relative to the current page. | |
| http_send_header/1 | This API provides an alternative for writing the header field as a CGI header. | |
| http_spawned/1 | Internal use only. | |
| http_wrap_spawned/3 | Internal use only. | |
| http_wrapper/5 | Simple wrapper to read and decode an HTTP header from `In', call :Goal while watching for exceptions and send the result to the stream `Out'. | |
| hub.pl -- Manage a hub for websockets | ||
| current_hub/2 | True when there exists a hub Hub with Name. | |
| hub_add/3 | Add a WebSocket to the hub. | |
| hub_broadcast/2 | Send Message to all websockets associated with Hub for which call(Condition, Id) succeeds. | |
| hub_broadcast/3 | Send Message to all websockets associated with Hub for which call(Condition, Id) succeeds. | |
| hub_create/3 | Create a new hub. | |
| hub_member/2 | True when Id is a member of the hub HubName. | |
| hub_send/2 | Send message to the indicated ClientId. | |
| jquery.pl -- Provide JQuery | ||
| js_grammar.pl -- JavaScript grammar | ||
| js_token/3 | Matches and classifies the next JavaScript token. | |
| js_write.pl -- Utilities for including JavaScript | ||
| javascript/4 | Quasi quotation parser for JavaScript that allows for embedding Prolog variables to substitude identifiers in the JavaScript snippet. | |
| js_arg/3 | Same as js_expression//1, but fails if Expression is invalid, where js_expression//1 raises an error. | |
| js_arg_list/3 | Write javascript (function) arguments. | |
| js_call/3 | Emit a call to a Javascript function. | |
| js_expression/3 | Emit a single JSON argument. | |
| js_new/4 | Emit a call to a Javascript object declaration. | |
| js_script/3 | Generate a JavaScript script element with the given content. | |
| json.pl -- Reading and writing JSON serialization | ||
| atom_json_dict/3 | Convert between textual representation and a JSON term represented as a dict. | |
| atom_json_term/3 | Convert between textual representation and a JSON term. | |
| is_json_term/1 | True if Term is a json term. | |
| is_json_term/2 | True if Term is a json term. | |
| json_read/2 | Read next JSON value from Stream into a Prolog term. | |
| json_read/3 | Read next JSON value from Stream into a Prolog term. | |
| json_read_dict/2 | Read a JSON object, returning objects as a dicts. | |
| json_read_dict/3 | Read a JSON object, returning objects as a dicts. | |
| json_write/2 | Write a JSON term to Stream. | |
| json_write/3 | Write a JSON term to Stream. | |
| json_write_dict/2 | Write a JSON term, represented using dicts. | |
| json_write_dict/3 | Write a JSON term, represented using dicts. | |
| json_write_hook/4 | Hook that can be used to emit a JSON representation for Term to Stream. | |
| json_convert.pl -- Convert between JSON terms and Prolog application terms | ||
| current_json_object/3 | Multifile predicate computed from the json_object/1 declarations. | |
| json_object/1 | Declare a JSON object. | |
| json_to_prolog/2 | Translate a JSON term into an application term. | |
| prolog_to_json/2 | Translate a Prolog application Term into a JSON object term. | |
| mimepack.pl -- Create a MIME message | ||
| mime_pack/3 | Pack a number of inputs into a MIME package using a specified or generated boundary. | |
| mimetype.pl -- Determine mime-type for a file | ||
| charset/3 | Hook that determines the Charset for File that has media type MediaType. | |
| mime_extension/2 | Hook that is called by file_mime_type/2 before the default table is examined. | |
| file_content_type/2 | True if File should be served using ContentType: ContentType. | |
| file_content_type/3 | True if File should be served using ContentType: ContentType. | |
| file_mime_type/2 | True when MimeType is the mime-type to be used for sending FileName. | |
| term_html.pl -- Represent Prolog terms as HTML | ||
| term/4 | Render a Prolog term as a structured HTML tree. | |
| thread_httpd.pl -- Threaded HTTP server | ||
| schedule_workers/1 | Hook called if a new connection or a keep-alive connection cannot be scheduled immediately to a worker. | |
| http_add_worker/2 | Add a new worker to the HTTP server for port Port. | |
| http_close_connection/1 | Close connection associated to Request. | |
| http_current_server/2 | True if Goal is the goal of a server at Port. | |
| http_current_worker/2 | True if ThreadID is the identifier of a Prolog thread serving Port. | |
| http_enough_workers/3 | Check that we have enough workers in our queue. | |
| http_requeue/1 | Re-queue a connection to the worker pool. | |
| http_server/2 | Create a server at Port that calls Goal for each parsed request. | |
| http_server_property/2 | True if Property is a property of the HTTP server running at Port. | |
| http_spawn/2 | Continue this connection on a new thread. | |
| http_stop_server/2 | Stop the indicated HTTP server gracefully. | |
| http_workers/2 | Query or set the number of workers for the server at this port. | |
| message_level/2 | Determine the message stream used for exceptions that may occur during server_loop/5. | |
| websocket.pl -- WebSocket support | ||
| http_open_websocket/3 | Establish a client websocket connection. | |
| http_upgrade_to_websocket/3 | Create a websocket connection running call(Goal, WebSocket), where WebSocket is a socket-pair. | |
| ws_close/3 | Close a WebSocket connection by sending a close message if this was not already sent and wait for the close reply. | |
| ws_open/3 | Turn a raw TCP/IP (or any other binary stream) into a websocket stream. | |
| ws_property/2 | True if Property is a property WebSocket. | |
| ws_receive/2 | Receive the next message from WebSocket. | |
| ws_receive/3 | Receive the next message from WebSocket. | |
| ws_send/2 | Send a message over a websocket. | |
| yadis.pl -- Yadis discovery | ||
| xrds_dom/2 | True when XRDS_DOM is a parsed XML document for the given resource. | |
| xrds_location/2 | Discover the location of the XRDS document from the given Id. | |