WebKit2GTK+ Reference Manual: WebKitWebContext

## WebKitWebContext WebKitWebContext — Manages aspects common to all WebKitWebViews |

## Functions

WebKitWebContext * | webkit_web_context_get_default ()
WebKitCacheModel | webkit_web_context_get_cache_model ()
void | webkit_web_context_set_cache_model ()
void | webkit_web_context_clear_cache ()
WebKitDownload * | webkit_web_context_download_uri ()
WebKitCookieManager * | webkit_web_context_get_cookie_manager ()
WebKitFaviconDatabase * | webkit_web_context_get_favicon_database ()
void | webkit_web_context_set_favicon_database_directory ()
const gchar * | webkit_web_context_get_favicon_database_directory ()
WebKitSecurityManager * | webkit_web_context_get_security_manager ()
void | webkit_web_context_set_additional_plugins_directory ()
void | webkit_web_context_get_plugins ()
GList * | webkit_web_context_get_plugins_finish ()
gboolean | webkit_web_context_get_spell_checking_enabled ()
void | webkit_web_context_set_spell_checking_enabled ()
const gchar * const * | webkit_web_context_get_spell_checking_languages ()
void | webkit_web_context_set_spell_checking_languages ()
void | webkit_web_context_set_preferred_languages ()
void | webkit_web_context_set_tls_errors_policy ()
WebKitTLSErrorsPolicy | webkit_web_context_get_tls_errors_policy ()
void | webkit_web_context_set_web_extensions_directory ()
void | webkit_web_context_set_web_extensions_initialization_user_data ()
void | webkit_web_context_prefetch_dns ()
void | webkit_web_context_set_disk_cache_directory ()
void | webkit_web_context_allow_tls_certificate_for_host ()
WebKitProcessModel | webkit_web_context_get_process_model ()
void | webkit_web_context_set_process_model ()
void | (*WebKitURISchemeRequestCallback) ()
void | webkit_web_context_register_uri_scheme ()

## Signals

void | download-started | Run Last
void | initialize-web-extensions | Run Last

## Types and Values

struct | WebKitWebContext
enum | WebKitCacheModel
enum | WebKitProcessModel
enum | WebKitTLSErrorsPolicy

## Object Hierarchy

        GObject
        ╰── WebKitWebContext

## Description

The WebKitWebContext manages all aspects common to all WebKitWebViews.

You can define the WebKitCacheModel and WebKitProcessModel with `webkit_web_context_set_cache_model()` and `webkit_web_context_set_process_model()`, depending on the needs of your application. You can access the WebKitCookieManager or the WebKitSecurityManager to specify the behaviour of your application regarding cookies and security, using `webkit_web_context_get_cookie_manager()` and `webkit_web_context_get_security_manager()` for that.

It is also possible to change your preferred language or enable spell checking, using `webkit_web_context_set_preferred_languages()`, `webkit_web_context_set_spell_checking_languages()` and `webkit_web_context_set_spell_checking_enabled()`.

You can use `webkit_web_context_register_uri_scheme()` to register custom URI schemes, and manage several other settings.

## Functions

### webkit_web_context_get_default ()

    WebKitWebContext *
    webkit_web_context_get_default (void);

Gets the default web context

#### Returns

a WebKitWebContext.

[transfer none]

### webkit_web_context_get_cache_model ()

    WebKitCacheModel
    webkit_web_context_get_cache_model (WebKitWebContext *context);

Returns the current cache model. For more information about this value check the documentation of the function `webkit_web_context_set_cache_model()`.

#### Parameters

context | the WebKitWebContext |

#### Returns

the current WebKitCacheModel

### webkit_web_context_set_cache_model ()

    void
    webkit_web_context_set_cache_model (WebKitWebContext *context,
                                        WebKitCacheModel cache_model);

Specifies a usage model for WebViews, which WebKit will use to determine its caching behavior. All web views follow the cache model. This cache model determines the RAM and disk space to use for caching previously viewed content .

Research indicates that users tend to browse within clusters of documents that hold resources in common, and to revisit previously visited documents. WebKit and the frameworks below it include built-in caches that take advantage of these patterns, substantially improving document load speed in browsing situations. The WebKit cache model controls the behaviors of all of these caches, including various WebCore caches.

Browsers can improve document load speed substantially by specifying `WEBKIT_CACHE_MODEL_WEB_BROWSER`. Applications without a browsing interface can reduce memory usage substantially by specifying `WEBKIT_CACHE_MODEL_DOCUMENT_VIEWER`. The default value is `WEBKIT_CACHE_MODEL_WEB_BROWSER`.

#### Parameters

context | the WebKitWebContext |
cache_model | a WebKitCacheModel |

### webkit_web_context_clear_cache ()

    void
    webkit_web_context_clear_cache (WebKitWebContext *context);

Clears all resources currently cached. See also `webkit_web_context_set_cache_model()`.

#### Parameters

context | a WebKitWebContext |

### webkit_web_context_download_uri ()

    WebKitDownload *
    webkit_web_context_download_uri (WebKitWebContext *context,
                                     const gchar *uri);

Requests downloading of the specified URI string. The download operation will not be associated to any WebKitWebView, if you are interested in starting a download from a particular WebKitWebView use `webkit_web_view_download_uri()` instead.

#### Parameters

context | a WebKitWebContext |
uri | the URI to download |

#### Returns

a new WebKitDownload representing the the download operation.

[transfer full]

### webkit_web_context_get_cookie_manager ()

    WebKitCookieManager *
    webkit_web_context_get_cookie_manager (WebKitWebContext *context);

Get the WebKitCookieManager of `context` .

#### Parameters

context | a WebKitWebContext |

#### Returns

the WebKitCookieManager of `context` .

[transfer none]

### webkit_web_context_get_favicon_database ()

    WebKitFaviconDatabase *
    webkit_web_context_get_favicon_database
                                   (WebKitWebContext *context);

Get the WebKitFaviconDatabase associated with `context` .

To initialize the database you need to call `webkit_web_context_set_favicon_database_directory()`.

#### Parameters

context | a WebKitWebContext |

#### Returns

the WebKitFaviconDatabase of `context` .

[transfer none]

### webkit_web_context_set_favicon_database_directory ()

    void
    webkit_web_context_set_favicon_database_directory
                                   (WebKitWebContext *context,
                                    const gchar *path);

Set the directory path to be used to store the favicons database for `context` on disk. Passing `NULL` as `path` means using the default directory for the platform (see `g_get_user_data_dir()`).

Calling this method also means enabling the favicons database for its use from the applications, so that's why it's expected to be called only once. Further calls for the same instance of WebKitWebContext won't cause any effect.

#### Parameters

context | a WebKitWebContext |
path | an absolute path to the icon database directory or `NULL` to use the defaults. | [allow-none]

### webkit_web_context_get_favicon_database_directory ()

    const gchar *
    webkit_web_context_get_favicon_database_directory
                                   (WebKitWebContext *context);

Get the directory path being used to store the favicons database for `context` , or `NULL` if `webkit_web_context_set_favicon_database_directory()` hasn't been called yet.

This function will always return the same path after having called `webkit_web_context_set_favicon_database_directory()` for the first time.

#### Parameters

context | a WebKitWebContext |

#### Returns

the path of the directory of the favicons database associated with `context` , or `NULL`.

[transfer none]

### webkit_web_context_get_security_manager ()

    WebKitSecurityManager *
    webkit_web_context_get_security_manager
                                   (WebKitWebContext *context);

Get the WebKitSecurityManager of `context` .

#### Parameters

context | a WebKitWebContext |

#### Returns

the WebKitSecurityManager of `context` .

[transfer none]

### webkit_web_context_set_additional_plugins_directory ()

    void
    webkit_web_context_set_additional_plugins_directory
                                   (WebKitWebContext *context,
                                    const gchar *directory);

Set an additional directory where WebKit will look for plugins.

#### Parameters

context | a WebKitWebContext |
directory | the directory to add |

### webkit_web_context_get_plugins ()

    void
    webkit_web_context_get_plugins (WebKitWebContext *context,
                                    GCancellable *cancellable,
                                    GAsyncReadyCallback callback,
                                    gpointer user_data);

Asynchronously get the list of installed plugins.

When the operation is finished, `callback` will be called. You can then call `webkit_web_context_get_plugins_finish()` to get the result of the operation.

#### Parameters

context | a WebKitWebContext |
cancellable | a GCancellable or `NULL` to ignore. | [allow-none]
callback | a GAsyncReadyCallback to call when the request is satisfied. | [scope async]
user_data | the data to pass to callback function. | [closure]

### webkit_web_context_get_plugins_finish ()

    GList *
    webkit_web_context_get_plugins_finish (WebKitWebContext *context,
                                           GAsyncResult *result,
                                           GError **error);

Finish an asynchronous operation started with webkit_web_context_get_plugins.

#### Parameters

context | a WebKitWebContext |
result | a GAsyncResult |
error | return location for error or `NULL` to ignore |

#### Returns

a GList of WebKitPlugin. You must free the GList with `g_list_free()` and unref the WebKitPlugins with `g_object_unref()` when you're done with them.

[element-type WebKitPlugin][transfer full]

### webkit_web_context_get_spell_checking_enabled ()

    gboolean
    webkit_web_context_get_spell_checking_enabled
                                   (WebKitWebContext *context);

Get whether spell checking feature is currently enabled.

#### Parameters

context | a WebKitWebContext |

#### Returns

`TRUE` If spell checking is enabled, or `FALSE` otherwise.

### webkit_web_context_set_spell_checking_enabled ()

    void
    webkit_web_context_set_spell_checking_enabled
                                   (WebKitWebContext *context,
                                    gboolean enabled);

Enable or disable the spell checking feature.

#### Parameters

context | a WebKitWebContext |
enabled | Value to be set |

### webkit_web_context_get_spell_checking_languages ()

    const gchar * const *
    webkit_web_context_get_spell_checking_languages
                                   (WebKitWebContext *context);

Get the the list of spell checking languages associated with `context` , or `NULL` if no languages have been previously set.

See `webkit_web_context_set_spell_checking_languages()` for more details on the format of the languages in the list.

#### Parameters

context | a WebKitWebContext |

#### Returns

A `NULL`-terminated array of languages if available, or `NULL` otherwise.

[array zero-terminated=1][element-type utf8][transfer none]

### webkit_web_context_set_spell_checking_languages ()

    void
    webkit_web_context_set_spell_checking_languages
                                   (WebKitWebContext *context,
                                    const gchar * const *languages);

Set the list of spell checking languages to be used for spell checking.

The locale string typically is in the form lang_COUNTRY, where lang is an ISO-639 language code, and COUNTRY is an ISO-3166 country code. For instance, sv_FI for Swedish as written in Finland or pt_BR for Portuguese as written in Brazil.

You need to call this function with a valid list of languages at least once in order to properly enable the spell checking feature in WebKit.

#### Parameters

context | a WebKitWebContext |
languages | a `NULL`-terminated list of spell checking languages. | [array zero-terminated=1][transfer none]

### webkit_web_context_set_preferred_languages ()

    void
    webkit_web_context_set_preferred_languages
                                   (WebKitWebContext *context,
                                    const gchar * const *languages);

Set the list of preferred languages, sorted from most desirable to least desirable. The list will be used to build the "Accept-Language" header that will be included in the network requests started by the WebKitWebContext.

#### Parameters

context | a WebKitWebContext |
languages | a `NULL`-terminated list of language identifiers. | [allow-none][array zero-terminated=1][element-type utf8][transfer none]

### webkit_web_context_set_tls_errors_policy ()

    void
    webkit_web_context_set_tls_errors_policy
                                   (WebKitWebContext *context,
                                    WebKitTLSErrorsPolicy policy);

Set the TLS errors policy of `context` as `policy`

#### Parameters

context | a WebKitWebContext |
policy | a WebKitTLSErrorsPolicy |

### webkit_web_context_get_tls_errors_policy ()

    WebKitTLSErrorsPolicy
    webkit_web_context_get_tls_errors_policy
                                   (WebKitWebContext *context);

Get the TLS errors policy of `context`

#### Parameters

context | a WebKitWebContext |

#### Returns

a WebKitTLSErrorsPolicy

### webkit_web_context_set_web_extensions_directory ()

    void
    webkit_web_context_set_web_extensions_directory
                                   (WebKitWebContext *context,
                                    const gchar *directory);

Set the directory where WebKit will look for Web Extensions. This method must be called before loading anything in this context, otherwise it will not have any effect. You can connect to “initialize-web-extensions” to call this method before anything is loaded.

#### Parameters

context | a WebKitWebContext |
directory | the directory to add |

### webkit_web_context_set_web_extensions_initialization_user_data ()

    void
    webkit_web_context_set_web_extensions_initialization_user_data
                                   (WebKitWebContext *context,
                                    GVariant *user_data);

Set user data to be passed to Web Extensions on initialization. The data will be passed to the WebKitWebExtensionInitializeWithUserDataFunction. This method must be called before loading anything in this context, otherwise it will not have any effect. You can connect to “initialize-web-extensions” to call this method before anything is loaded.

#### Parameters

context | a WebKitWebContext |
user_data | a GVariant |

Since 2.4

### webkit_web_context_prefetch_dns ()

    void
    webkit_web_context_prefetch_dns (WebKitWebContext *context,
                                     const gchar *hostname);

Resolve the domain name of the given `hostname` in advance, so that if a URI of `hostname` is requested the load will be performed more quickly.

#### Parameters

context | a WebKitWebContext |
hostname | a hostname to be resolved |

### webkit_web_context_set_disk_cache_directory ()

    void
    webkit_web_context_set_disk_cache_directory
                                   (WebKitWebContext *context,
                                    const gchar *directory);

Set the directory where disk cache files will be stored This method must be called before loading anything in this context, otherwise it will not have any effect.

#### Parameters

context | a WebKitWebContext |
directory | the directory to set |

### webkit_web_context_allow_tls_certificate_for_host ()

    void
    webkit_web_context_allow_tls_certificate_for_host
                                   (WebKitWebContext *context,
                                    WebKitCertificateInfo *info,
                                    const gchar *host);

Ignore further TLS errors on the `host` for the certificate present in `info` .

#### Parameters

context | a WebKitWebContext |
info | a WebKitCertificateInfo |
host | the host for which a certificate is to be allowed |

Since 2.4

### webkit_web_context_get_process_model ()

    WebKitProcessModel
    webkit_web_context_get_process_model (WebKitWebContext *context);

Returns the current process model. For more information about this value see `webkit_web_context_set_process_model()`.

#### Parameters

context | the WebKitWebContext |

#### Returns

the current WebKitProcessModel

Since 2.4

### webkit_web_context_set_process_model ()

    void
    webkit_web_context_set_process_model (WebKitWebContext *context,
                                          WebKitProcessModel process_model);

Specifies a process model for WebViews, which WebKit will use to determine how auxiliary processes are handled. The default setting (`WEBKIT_PROCESS_MODEL_SHARED_SECONDARY_PROCESS`) is suitable for most applications which embed a small amount of WebViews, or are used to display documents which are considered safe — like local files.

Applications which may potentially use a large amount of WebViews —for example a multi-tabbed web browser— may want to use `WEBKIT_PROCESS_MODEL_MULTIPLE_SECONDARY_PROCESSES`, which will use one process per view most of the time, while still allowing for web views to share a process when needed (for example when different views interact with each other). Using this model, when a process hangs or crashes, only the WebViews using it stop working, while the rest of the WebViews in the application will still function normally.

This method **must be called before any other functions**, as early as possible in your application. Calling it later will make your application crash.

#### Parameters

context | the WebKitWebContext |
process_model | a WebKitProcessModel |

Since 2.4

### WebKitURISchemeRequestCallback ()

    void
    (*WebKitURISchemeRequestCallback) (WebKitURISchemeRequest *request,
                                       gpointer user_data);

Type definition for a function that will be called back when an URI request is made for a user registered URI scheme.

#### Parameters

request | the WebKitURISchemeRequest |
user_data | user data passed to the callback |

### webkit_web_context_register_uri_scheme ()

    void
    webkit_web_context_register_uri_scheme
                                   (WebKitWebContext *context,
                                    const gchar *scheme,
                                    WebKitURISchemeRequestCallback callback,
                                    gpointer user_data,
                                    GDestroyNotify user_data_destroy_func);

Register `scheme` in `context` , so that when an URI request with `scheme` is made in the WebKitWebContext, the WebKitURISchemeRequestCallback registered will be called with a WebKitURISchemeRequest. It is possible to handle URI scheme requests asynchronously, by calling `g_object_ref()` on the WebKitURISchemeRequest and calling `webkit_uri_scheme_request_finish()` later when the data of the request is available or `webkit_uri_scheme_request_finish_error()` in case of error.

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    static void
    about_uri_scheme_request_cb (WebKitURISchemeRequest *request,
                                 gpointer                user_data)
    {
        GInputStream *stream;
        gsize         stream_length;
        const gchar  *path;

        path = webkit_uri_scheme_request_get_path (request);
        if (!g_strcmp0 (path, "plugins")) {
            /* Create a GInputStream with the contents of plugins about page, and set its length to stream_length */
        } else if (!g_strcmp0 (path, "memory")) {
            /* Create a GInputStream with the contents of memory about page, and set its length to stream_length */
        } else if (!g_strcmp0 (path, "applications")) {
            /* Create a GInputStream with the contents of applications about page, and set its length to stream_length */
        } else if (!g_strcmp0 (path, "example")) {
            gchar *contents;

            contents = g_strdup_printf ("<html><body><p>Example about page</p></body></html>");
            stream_length = strlen (contents);
            stream = g_memory_input_stream_new_from_data (contents, stream_length, g_free);
        } else {
            GError *error;

            error = g_error_new (ABOUT_HANDLER_ERROR, ABOUT_HANDLER_ERROR_INVALID, "Invalid about:%s page.", path);
            webkit_uri_scheme_request_finish_error (request, error);
            g_error_free (error);
            return;
        }
        webkit_uri_scheme_request_finish (request, stream, stream_length, "text/html");
        g_object_unref (stream);
    }

#### Parameters

context | a WebKitWebContext |
scheme | the network scheme to register |
callback | a WebKitURISchemeRequestCallback. | [scope async]
user_data | data to pass to callback function |
user_data_destroy_func | destroy notify for `user_data` |

## Types and Values

### struct WebKitWebContext

    struct WebKitWebContext;

### enum WebKitCacheModel

Enum values used for determining the WebKitWebContext cache model.

#### Members

WEBKIT_CACHE_MODEL_DOCUMENT_VIEWER | Disable the cache completely, which substantially reduces memory usage. Useful for applications that only access a single local file, with no navigation to other pages. No remote resources will be cached. |
WEBKIT_CACHE_MODEL_WEB_BROWSER | Improve document load speed substantially by caching a very large number of resources and previously viewed content. |
WEBKIT_CACHE_MODEL_DOCUMENT_BROWSER | A cache model optimized for viewing a series of local files -- for example, a documentation viewer or a website designer. WebKit will cache a moderate number of resources. |

### enum WebKitProcessModel

Enum values used for determining the WebKitWebContext process model.

#### Members

WEBKIT_PROCESS_MODEL_SHARED_SECONDARY_PROCESS | Use a single process to perform content rendering. The process is shared among all the WebKitWebView instances created by the application: if the process hangs or crashes all the web views in the application will be affected. This is the default process model, and it should suffice for most cases. |
WEBKIT_PROCESS_MODEL_MULTIPLE_SECONDARY_PROCESSES | Use one process for each WebKitWebView, while still allowing for some of them to share a process in certain situations. The main advantage of this process model is that the rendering process for a web view can crash while the rest of the views keep working normally. This process model is indicated for applications which may use a number of web views and the content of in each must not interfere with the rest — for example a full-fledged web browser with support for multiple tabs. |

Since 2.4

### enum WebKitTLSErrorsPolicy

Enum values used to denote the TLS errors policy.

#### Members

WEBKIT_TLS_ERRORS_POLICY_IGNORE | Ignore TLS errors. |
WEBKIT_TLS_ERRORS_POLICY_FAIL | TLS errors will emit “load-failed-with-tls-errors” and, if the signal is handled, finish the load. In case the signal is not handled, “load-failed” is emitted before the load finishes. |

## Signal Details

### The `“download-started”` signal

    void
    user_function (WebKitWebContext *context,
                   WebKitDownload   *download,
                   gpointer          user_data)

This signal is emitted when a new download request is made.

#### Parameters

context | the WebKitWebContext |
download | the WebKitDownload associated with this event |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

### The `“initialize-web-extensions”` signal

    void
    user_function (WebKitWebContext *context,
                   gpointer          user_data)

This signal is emitted when a new web process is about to be launched. It signals the most appropriate moment to use `webkit_web_context_set_web_extensions_initialization_user_data()` and `webkit_web_context_set_web_extensions_directory()`.

#### Parameters

context | the WebKitWebContext |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since 2.4