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12.3. Configuring a Service Provider
12.3.1. Mechanisms for a HTTP Service Provider
HTTP service provider endpoints can specify a number of HTTP connection attributes including if it will honor keep alive requests, how it interacts with caches, and how tolerant it is of errors in communicating with a consumer.
A service provider endpoint can be configured using two mechanisms:
12.3.2. Using Configuration
Namespace
The elements used to configure an HTTP provider endpoint are defined in the namespace http://cxf.apache.org/transports/http/configuration. It is commonly referred to using the prefix
http-conf. In order to use the HTTP configuration elements you must add the lines shown in Example 12.9, “HTTP Provider Configuration Namespace” to the beans element of your endpoint's configuration file. In addition, you must add the configuration elements' namespace to the xsi:schemaLocation attribute.
Example 12.9. HTTP Provider Configuration Namespace
<beans ...
xmlns:http-conf="http://cxf.apache.org/transports/http/configuration"
...
xsi:schemaLocation="...
http://cxf.apache.org/transports/http/configuration
http://cxf.apache.org/schemas/configuration/http-conf.xsd
...">Jetty runtime or Netty runtime
You can use the elements from the
http-conf namespace to configure either the Jetty runtime or the Netty runtime.
The destination element
You configure an HTTP service provider endpoint using the
http-conf:destination element and its children. The http-conf:destination element takes a single attribute, name, that specifies the WSDL port element that corresponds to the endpoint. The value for the name attribute takes the form portQName.http-destination. Example 12.10, “http-conf:destination Element” shows the http-conf:destination element that is used to add configuration for an endpoint that is specified by the WSDL fragment <port binding="widgetSOAPBinding" name="widgetSOAPPort> when the endpoint's target namespace is http://widgets.widgetvendor.net.
Example 12.10. http-conf:destination Element
...
<http-conf:destination name="{http://widgets/widgetvendor.net}widgetSOAPPort.http-destination">
...
</http-conf:destination>
...
The
http-conf:destination element has a number of child elements that specify configuration information. They are described in Table 12.4, “Elements Used to Configure an HTTP Service Provider Endpoint”.
| Element | Description |
|---|---|
http-conf:server |
Specifies the HTTP connection properties. See the section called “The server element”.
|
http-conf:contextMatchStrategy |
Specifies the parameters that configure the context match strategy for processing HTTP requests.
|
http-conf:fixedParameterOrder |
Specifies whether the parameter order of an HTTP request handled by this destination is fixed.
|
The server element
The
http-conf:server element is used to configure the properties of a service provider endpoint's HTTP connection. Its attributes, described in Table 12.5, “HTTP Service Provider Configuration Attributes”, specify the connection's properties.
| Attribute | Description |
|---|---|
ReceiveTimeout |
Sets the length of time, in milliseconds, the service provider attempts to receive a request before the connection times out. The default is
30000.
0 specifies that the provider will not timeout.
|
SuppressClientSendErrors |
Specifies whether exceptions are to be thrown when an error is encountered on receiving a request. The default is
false; exceptions are thrown on encountering errors.
|
SuppressClientReceiveErrors |
Specifies whether exceptions are to be thrown when an error is encountered on sending a response to a consumer. The default is
false; exceptions are thrown on encountering errors.
|
HonorKeepAlive |
Specifies whether the service provider honors requests for a connection to remain open after a response has been sent. The default is
false; keep-alive requests are ignored.
|
RedirectURL |
Specifies the URL to which the client request should be redirected if the URL specified in the client request is no longer appropriate for the requested resource. In this case, if a status code is not automatically set in the first line of the server response, the status code is set to
302 and the status description is set to Object Moved. The value is used as the value of the HTTP RedirectURL property.
|
CacheControl |
Specifies directives about the behavior that must be adhered to by caches involved in the chain comprising a response from a service provider to a consumer. See Section 12.3.4, “Service Provider Cache Control Directives”.
|
ContentLocation |
Sets the URL where the resource being sent in a response is located.
|
ContentType |
Specifies the media type of the information being sent in a response. Media types are specified using multipurpose internet mail extensions (MIME) types. The value is used as the value of the HTTP ContentType location.
|
ContentEncoding |
Specifies any additional content encodings that have been applied to the information being sent by the service provider. Content encoding labels are regulated by the Internet Assigned Numbers Authority (IANA). Possible content encoding values include
zip, gzip, compress, deflate, and identity. This value is used as the value of the HTTP ContentEncoding property.
The primary use of content encodings is to allow documents to be compressed using some encoding mechanism, such as zip or gzip. Apache CXF performs no validation on content codings. It is the user’s responsibility to ensure that a specified content coding is supported at application level.
|
ServerType |
Specifies what type of server is sending the response. Values take the form
program-name/version; for example, Apache/1.2.5.
|
Example
Example 12.11, “HTTP Service Provider Endpoint Configuration” shows the configuration for an HTTP service provider endpoint that honors keep-alive requests and suppresses all communication errors.
Example 12.11. HTTP Service Provider Endpoint Configuration
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:http-conf="http://cxf.apache.org/transports/http/configuration"
xsi:schemaLocation="http://cxf.apache.org/transports/http/configuration
http://cxf.apache.org/schemas/configuration/http-conf.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<http-conf:destination name="{http://apache.org/hello_world_soap_http}SoapPort.http-destination">
<http-conf:server SuppressClientSendErrors="true"
SuppressClientReceiveErrors="true"
HonorKeepAlive="true" />
</http-conf:destination>
</beans>12.3.3. Using WSDL
Namespace
The WSDL extension elements used to configure an HTTP provider endpoint are defined in the namespace http://cxf.apache.org/transports/http/configuration. It is commonly referred to using the prefix
http-conf. To use the HTTP configuration elements you must add the line shown in Example 12.12, “HTTP Provider WSDL Element's Namespace” to the definitions element of your endpoint's WSDL document.
Example 12.12. HTTP Provider WSDL Element's Namespace
<definitions ...
xmlns:http-conf="http://cxf.apache.org/transports/http/configuration"Jetty runtime or Netty runtime
You can use the elements from the
http-conf namespace to configure either the Jetty runtime or the Netty runtime.
The server element
The
http-conf:server element is used to specify the connection properties of an HTTP service provider in a WSDL document. The http-conf:server element is a child of the WSDL port element. It has the same attributes as the server element used in the configuration file. The attributes are described in Table 12.5, “HTTP Service Provider Configuration Attributes”.
Example
Example 12.13, “WSDL to Configure an HTTP Service Provider Endpoint” shows a WSDL fragment that configures an HTTP service provider endpoint specifying that it will not interact with caches.
Example 12.13. WSDL to Configure an HTTP Service Provider Endpoint
<service ... >
<port ... >
<soap:address ... />
<http-conf:server CacheControl="no-cache" />
</port>
</service>12.3.4. Service Provider Cache Control Directives
Table 12.6, “
http-conf:server Cache Control Directives” lists the cache control directives supported by an HTTP service provider.
| Directive | Behavior |
|---|---|
| no-cache |
Caches cannot use a particular response to satisfy subsequent requests without first revalidating that response with the server. If specific response header fields are specified with this value, the restriction applies only to those header fields within the response. If no response header fields are specified, the restriction applies to the entire response.
|
| public |
Any cache can store the response.
|
| private |
Public (shared) caches cannot store the response because the response is intended for a single user. If specific response header fields are specified with this value, the restriction applies only to those header fields within the response. If no response header fields are specified, the restriction applies to the entire response.
|
| no-store |
Caches must not store any part of the response or any part of the request that invoked it.
|
| no-transform |
Caches must not modify the media type or location of the content in a response between a server and a client.
|
| must-revalidate |
Caches must revalidate expired entries that relate to a response before that entry can be used in a subsequent response.
|
| proxy-revalidate |
Does the same as must-revalidate, except that it can only be enforced on shared caches and is ignored by private unshared caches. When using this directive, the public cache directive must also be used.
|
| max-age |
Clients can accept a response whose age is no greater that the specified number of seconds.
|
| s-max-age |
Does the same as max-age, except that it can only be enforced on shared caches and is ignored by private unshared caches. The age specified by s-max-age overrides the age specified by max-age. When using this directive, the proxy-revalidate directive must also be used.
|
| cache-extension |
Specifies additional extensions to the other cache directives. Extensions can be informational or behavioral. An extended directive is specified in the context of a standard directive, so that applications not understanding the extended directive can adhere to the behavior mandated by the standard directive.
|
