QNetworkRequest 类保持要被发送的请求，采用 QNetworkAccessManager . 更多...
QNetworkRequest 类保持要被发送的请求，采用 QNetworkAccessManager .
QNetworkRequest is part of the Network Access API and is the class holding the information necessary to send a request over the network. It contains a URL and some ancillary information that can be used to modify the request.
属性代码，用于 QNetworkRequest and QNetworkReply .
Attributes are extra meta-data that are used to control the behavior of the request and to pass further information from the reply back to the application. Attributes are also extensible, allowing custom implementations to pass custom values.
The following table explains what the default attribute codes are, the QVariant types associated, the default value if said attribute is missing and whether it's used in requests or replies.
| 常量 | 值 | 描述 |
|---|---|---|
| QNetworkRequest.HttpStatusCodeAttribute | 0 | 仅回复，类型： QVariant.Int (no default) Indicates the HTTP status code received from the HTTP server (like 200, 304, 404, 401, etc.). If the connection was not HTTP-based, this attribute will not be present. |
| QNetworkRequest.HttpReasonPhraseAttribute | 1 | 仅回复，类型： QVariant.ByteArray (no default) Indicates the HTTP reason phrase as received from the HTTP server (like "Ok", "Found", "Not Found", "Access Denied", etc.) This is the human-readable representation of the status code (see above). If the connection was not HTTP-based, this attribute will not be present. |
| QNetworkRequest.RedirectionTargetAttribute | 2 | 仅回复，类型： QVariant.Url (no default) If present, it indicates that the server is redirecting the request to a different URL. The Network Access API does not by default follow redirections: it's up to the application to determine if the requested redirection should be allowed, according to its security policies. The returned URL might be relative. Use QUrl.resolved () to create an absolute URL out of it. |
| QNetworkRequest.ConnectionEncryptedAttribute | 3 | 仅回复，类型： QVariant.Bool (default: false) Indicates whether the data was obtained through an encrypted (secure) connection. |
| QNetworkRequest.CacheLoadControlAttribute | 4 | 仅请求，类型： QVariant.Int (default: QNetworkRequest.PreferNetwork ) Controls how the cache should be accessed. The possible values are those of QNetworkRequest.CacheLoadControl . Note that the default QNetworkAccessManager implementation does not support caching. However, this attribute may be used by certain backends to modify their requests (for example, for caching proxies). |
| QNetworkRequest.CacheSaveControlAttribute | 5 | 仅请求，类型： QVariant.Bool (default: true) Controls if the data obtained should be saved to cache for future uses. If the value is false, the data obtained will not be automatically cached. If true, data may be cached, provided it is cacheable (what is cacheable depends on the protocol being used). |
| QNetworkRequest.SourceIsFromCacheAttribute | 6 | 仅回复，类型： QVariant.Bool (default: false) Indicates whether the data was obtained from cache or not. |
| QNetworkRequest.DoNotBufferUploadDataAttribute | 7 | 仅请求，类型： QVariant.Bool (default: false) Indicates whether the QNetworkAccessManager code is allowed to buffer the upload data, e.g. when doing a HTTP POST. When using this flag with sequential upload data, the ContentLengthHeader header must be set. |
| QNetworkRequest.HttpPipeliningAllowedAttribute | 8 | 仅请求，类型： QVariant.Bool (default: false) Indicates whether the QNetworkAccessManager code is allowed to use HTTP pipelining with this request. |
| QNetworkRequest.HttpPipeliningWasUsedAttribute | 9 | 仅回复，类型： QVariant.Bool Indicates whether the HTTP pipelining was used for receiving this reply. |
| QNetworkRequest.CustomVerbAttribute | 10 | 仅请求，类型： QVariant.ByteArray Holds the value for the custom HTTP verb to send (destined for usage of other verbs than GET, POST, PUT and DELETE). This verb is set when calling QNetworkAccessManager.sendCustomRequest (). |
| QNetworkRequest.CookieLoadControlAttribute | 11 | 仅请求，类型： QVariant.Int (default: QNetworkRequest.Automatic ) Indicates whether to send 'Cookie' headers in the request. This attribute is set to false by QtWebKit when creating a cross-origin XMLHttpRequest where withCredentials has not been set explicitly to true by the Javascript that created the request. See here for more information. (This value was introduced in 4.7.) |
| QNetworkRequest.CookieSaveControlAttribute | 13 | 仅请求，类型： QVariant.Int (default: QNetworkRequest.Automatic ) Indicates whether to save 'Cookie' headers received from the server in reply to the request. This attribute is set to false by QtWebKit when creating a cross-origin XMLHttpRequest where withCredentials has not been set explicitly to true by the Javascript that created the request. See here for more information. (This value was introduced in 4.7.) |
| QNetworkRequest.AuthenticationReuseAttribute | 12 | 仅请求，类型： QVariant.Int (default: QNetworkRequest.Automatic ) Indicates whether to use cached authorization credentials in the request, if available. If this is set to QNetworkRequest.Manual and the authentication mechanism is 'Basic' or 'Digest', Qt will not send an an 'Authorization' HTTP header with any cached credentials it may have for the request's URL. This attribute is 设为 QNetworkRequest.Manual by QtWebKit when creating a cross-origin XMLHttpRequest where withCredentials has not been set explicitly to true by the Javascript that created the request. See here for more information. (This value was introduced in 4.7.) |
| QNetworkRequest.User | 1000 | Special type. Additional information can be passed in QVariants with types ranging from User to UserMax. The default implementation of Network Access will ignore any request attributes in this range and it will not produce any attributes in this range in replies. The range is reserved for extensions of QNetworkAccessManager . |
| QNetworkRequest.UserMax | 32767 | 特殊类型。见 User。 |
该枚举在 Qt 4.7 引入或被修改。
控制缓存机制，为 QNetworkAccessManager .
| 常量 | 值 | 描述 |
|---|---|---|
| QNetworkRequest.AlwaysNetwork | 0 | always load from network and do not check if the cache has a valid entry (similar to the "Reload" feature in browsers) |
| QNetworkRequest.PreferNetwork | 1 | default value; load from the network if the cached entry is older than the network entry |
| QNetworkRequest.PreferCache | 2 | load from cache if available, otherwise load from network. Note that this can return possibly stale (but not expired) items from cache. |
| QNetworkRequest.AlwaysCache | 3 | only load from cache, indicating error if the item was not cached (i.e., off-line mode) |
已知头类型列表 QNetworkRequest parses. Each known header is also represented in raw form with its full HTTP name.
| 常量 | 值 | 描述 |
|---|---|---|
| QNetworkRequest.ContentTypeHeader | 0 | corresponds to the HTTP Content-Type header and contains a string containing the media (MIME) type and any auxiliary data (for instance, charset) |
| QNetworkRequest.ContentLengthHeader | 1 | corresponds to the HTTP Content-Length header and contains the length in bytes of the data transmitted. |
| QNetworkRequest.LocationHeader | 2 | corresponds to the HTTP Location header and contains a URL representing the actual location of the data, including the destination URL in case of redirections. |
| QNetworkRequest.LastModifiedHeader | 3 | corresponds to the HTTP Last-Modified header and contains a QDateTime representing the last modification date of the contents |
| QNetworkRequest.CookieHeader | 4 | corresponds to the HTTP Cookie header and contains a QList < QNetworkCookie > representing the cookies to be sent back to the server |
| QNetworkRequest.SetCookieHeader | 5 | corresponds to the HTTP Set-Cookie header and contains a QList < QNetworkCookie > representing the cookies sent by the server to be stored locally |
另请参阅 header (), setHeader (), rawHeader ()，和 setRawHeader ().
Indicates if an aspect of the request's loading mechanism has been manually overridden, e.g. by QtWebKit .
| 常量 | 值 | 描述 |
|---|---|---|
| QNetworkRequest.Automatic | 0 | default value: indicates default behaviour. |
| QNetworkRequest.Manual | 1 | indicates behaviour has been manually overridden. |
该枚举在 Qt 4.7 引入或被修改。
此枚举列表可能的网络请求优先级。
| 常量 | 值 | 描述 |
|---|---|---|
| QNetworkRequest.HighPriority | 1 | 高优先级 |
| QNetworkRequest.NormalPriority | 3 | 正常优先级 |
| QNetworkRequest.LowPriority | 5 | 低优先级 |
该枚举在 Qt 4.7 引入或被修改。
构造 QNetworkRequest object with url 作为要请求的 URL。
Creates a copy of other .
返回的属性关联代码 code 。若 the attribute has not been set, it returns defaultValue .
Note: this function does not apply the defaults listed in QNetworkRequest.Attribute .
另请参阅 setAttribute () 和 QNetworkRequest.Attribute .
Returns true if the raw header headerName is present in this network request.
另请参阅 rawHeader () 和 setRawHeader ().
返回已知网络 Header 头的值为 header if it is present in this request. If it is not present, returns QVariant() (i.e., an invalid variant).
另请参阅 KnownHeaders , rawHeader ()，和 setHeader ().
Returns a reference to the object that initiated this network request; returns 0 if not set or the object has been destroyed.
该函数在 Qt 4.6 引入。
另请参阅 setOriginatingObject ().
返回此请求的优先级。
该函数在 Qt 4.7 引入。
另请参阅 setPriority ().
返回 Header 头的原生形式为 headerName . If no such header is present, an empty QByteArray is returned, which may be indistinguishable from a header that is present but has no content (use hasRawHeader () to find out if the header exists or not).
原生 Header 头可以被设置采用 setRawHeader () 或采用 setHeader ().
另请参阅 header () 和 setRawHeader ().
Returns a list of all raw headers that are set in this network request. The list is in the order that the headers were set.
另请参阅 hasRawHeader () 和 rawHeader ().
Sets the attribute associated with code code to be value value . If the attribute is already set, the previous value is discarded. In special, if value 是无效 QVariant , the attribute is unset.
另请参阅 attribute () 和 QNetworkRequest.Attribute .
Sets the value of the known header header to be value , overriding any previously set headers. This operation also sets the equivalent raw HTTP header.
另请参阅 KnownHeaders , setRawHeader ()，和 header ().
Allows setting a reference to the object initiating the request.
例如 QtWebKit sets the originating object to the QWebFrame that initiated the request.
该函数在 Qt 4.6 引入。
另请参阅 originatingObject ().
把此请求的优先级设为 priority .
注意： priority is only a hint to the network access manager. It can use it or not. Currently it is used for HTTP to decide which request should be sent first to a server.
该函数在 Qt 4.7 引入。
另请参阅 priority ().
设置 Header 头 headerName 到值 headerValue 。若 headerName corresponds to a known header (see QNetworkRequest.KnownHeaders ), the raw format will be parsed and the corresponding "cooked" header will be set as well.
例如：
request.setRawHeader("Last-Modified", "Sun, 06 Nov 1994 08:49:37 GMT");
还将设置已知 Header LastModifiedHeader to be the QDateTime object of the parsed date.
Note: setting the same header twice overrides the previous setting. To accomplish the behaviour of multiple HTTP headers of the same name, you should concatenate the two values, separating them with a comma (",") and set one single raw header.
另请参阅 KnownHeaders , setHeader (), hasRawHeader ()，和 rawHeader ().
Sets this network request's SSL configuration to be config . The settings that apply are the private key, the local certificate, the SSL protocol (SSLv2, SSLv3, TLSv1 where applicable), the CA certificates and the ciphers that the SSL backend is allowed to use.
By default, no SSL configuration is set, which allows the backends to choose freely what configuration is best for them.
另请参阅 sslConfiguration () 和 QSslConfiguration.defaultConfiguration ().
Sets the URL this network request is referring to to be url .
另请参阅 url ().
Returns this network request's SSL configuration. By default, no SSL settings are specified.
另请参阅 setSslConfiguration ().
返回此网络请求所引用的 URL。
另请参阅 setUrl ().
