[[resteasy-component]]
= Resteasy Component
//THIS FILE IS COPIED: EDIT THE SOURCE FILE:
:page-source: components/camel-resteasy/src/main/docs/resteasy-component.adoc
:docTitle: Resteasy
:artifactId: camel-resteasy
:description: Expose REST endpoints and access external REST servers.
:since: 3.4
:supportLevel: Preview
:component-header: Both producer and consumer are supported

*Since Camel {since}*

*{component-header}*

The *resteasy:* component provides HTTP based
endpoints for consuming HTTP requests that arrive at
a HTTP endpoint that is bound to a published Servlet.

Maven users will need to add the following dependency to their `pom.xml`
for this component:

[source,xml]
---------------------------------------------------------------
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-resteasy</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
---------------------------------------------------------------

== URI format

[source,java]
---------------------------------
resteasy://relative_path[?options]
---------------------------------

You can append query options to the URI in the following format:
`?option=value&option=value&...`

=== Options

// component options: START
The Resteasy component supports 6 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *bridgeErrorHandler* (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean
| *proxyConsumersClasses* (consumer) | Proxy classes for consumer endpoints. Multiple classes can be separated by comma. |  | String
| *lazyStartProducer* (producer) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean
| *allowJavaSerializedObject* (advanced) | Whether to allow java serialization when a request uses context-type=application/x-java-serialized-object. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk. | false | boolean
| *basicPropertyBinding* (advanced) | Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities | false | boolean
| *headerFilterStrategy* (filter) | To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter header to and from Camel message. |  | HeaderFilterStrategy
|===
// component options: END


// endpoint options: START
The Resteasy endpoint is configured using URI syntax:

----
resteasy:httpUri
----

with the following path and query parameters:

=== Path Parameters (1 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *httpUri* | *Required* The url of the HTTP endpoint to call. |  | URI
|===


=== Query Parameters (42 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *chunked* (common) | If this option is false the Servlet will disable the HTTP streaming and set the content-length header on the response | true | boolean
| *disableStreamCache* (common) | Determines whether or not the raw input stream from Servlet is cached or not (Camel will read the stream into a in memory/overflow to file, Stream caching) cache. By default Camel will cache the Servlet input stream to support reading it multiple times to ensure it Camel can retrieve all data from the stream. However you can set this option to true when you for example need to access the raw stream, such as streaming it directly to a file or other persistent store. DefaultHttpBinding will copy the request input stream into a stream cache and put it into message body if this option is false to support reading the stream multiple times. If you use Servlet to bridge/proxy an endpoint then consider enabling this option to improve performance, in case you do not need to read the message payload multiple times. The http producer will by default cache the response body stream. If setting this option to true, then the producers will not cache the response body stream but use the response stream as-is as the message body. | false | boolean
| *resteasyMethod* (common) | Sets the resteasy method to process the request | GET | String
| *servletName* (common) | Sets the servlet name |  | String
| *transferException* (common) | If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type. On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk. | false | boolean
| *async* (consumer) | Configure the consumer to work in async mode | false | boolean
| *bridgeErrorHandler* (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean
| *httpMethodRestrict* (consumer) | Used to only allow consuming if the HttpMethod matches, such as GET/POST/PUT etc. Multiple methods can be specified separated by comma. |  | String
| *matchOnUriPrefix* (consumer) | Whether or not the consumer should try to find a target consumer by matching the URI prefix if no exact match is found. | false | boolean
| *muteException* (consumer) | If enabled and an Exchange failed processing on the consumer side the response's body won't contain the exception's stack trace. | false | boolean
| *responseBufferSize* (consumer) | To use a custom buffer size on the javax.servlet.ServletResponse. |  | Integer
| *eagerCheckContentAvailable* (consumer) | Whether to eager check whether the HTTP requests has content if the content-length header is 0 or not present. This can be turned on in case HTTP clients do not send streamed data. | false | boolean
| *exceptionHandler* (consumer) | To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. |  | ExceptionHandler
| *exchangePattern* (consumer) | Sets the exchange pattern when the consumer creates an exchange. The value can be one of: InOnly, InOut, InOptionalOut |  | ExchangePattern
| *optionsEnabled* (consumer) | Specifies whether to enable HTTP OPTIONS for this Servlet consumer. By default OPTIONS is turned off. | false | boolean
| *traceEnabled* (consumer) | Specifies whether to enable HTTP TRACE for this Servlet consumer. By default TRACE is turned off. | false | boolean
| *bridgeEndpoint* (producer) | If the option is true, HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint's URI for request. You may also set the option throwExceptionOnFailure to be false to let the HttpProducer send all the fault response back. | false | boolean
| *clearExpiredCookies* (producer) | Whether to clear expired cookies before sending the HTTP request. This ensures the cookies store does not keep growing by adding new cookies which is newer removed when they are expired. | true | boolean
| *connectionClose* (producer) | Specifies whether a Connection Close header must be added to HTTP Request. By default connectionClose is false. | false | boolean
| *copyHeaders* (producer) | If this option is true then IN exchange headers will be copied to OUT exchange headers according to copy strategy. Setting this to false, allows to only include the headers from the HTTP response (not propagating IN headers). | true | boolean
| *customHostHeader* (producer) | To use custom host header for producer. When not set in query will be ignored. When set will override host header derived from url. |  | String
| *httpMethod* (producer) | Configure the HTTP method to use. The HttpMethod header cannot override this option if set. The value can be one of: GET, POST, PUT, DELETE, HEAD, OPTIONS, TRACE, PATCH |  | HttpMethods
| *ignoreResponseBody* (producer) | If this option is true, The http producer won't read response body and cache the input stream | false | boolean
| *lazyStartProducer* (producer) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean
| *preserveHostHeader* (producer) | If the option is true, HttpProducer will set the Host header to the value contained in the current exchange Host header, useful in reverse proxy applications where you want the Host header received by the downstream server to reflect the URL called by the upstream client, this allows applications which use the Host header to generate accurate URL's for a proxied service | false | boolean
| *throwExceptionOnFailure* (producer) | Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code. | true | boolean
| *cookieHandler* (producer) | Configure a cookie handler to maintain a HTTP session |  | CookieHandler
| *deleteWithBody* (producer) | Whether the HTTP DELETE should include the message body or not. By default HTTP DELETE do not include any HTTP body. However in some rare cases users may need to be able to include the message body. | false | boolean
| *getWithBody* (producer) | Whether the HTTP GET should include the message body or not. By default HTTP GET do not include any HTTP body. However in some rare cases users may need to be able to include the message body. | false | boolean
| *okStatusCodeRange* (producer) | The status codes which are considered a success response. The values are inclusive. Multiple ranges can be defined, separated by comma, e.g. 200-204,209,301-304. Each range must be a single number or from-to with the dash included. | 200-299 | String
| *basicPropertyBinding* (advanced) | Whether the endpoint should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities | false | boolean
| *headerFilterStrategy* (advanced) | To use a custom HeaderFilterStrategy to filter header to and from Camel message. |  | HeaderFilterStrategy
| *mapHttpMessageBody* (advanced) | If this option is true then IN exchange Body of the exchange will be mapped to HTTP body. Setting this to false will avoid the HTTP mapping. | true | boolean
| *mapHttpMessageFormUrlEncoded Body* (advanced) | If this option is true then IN exchange Form Encoded body of the exchange will be mapped to HTTP. Setting this to false will avoid the HTTP Form Encoded body mapping. | true | boolean
| *mapHttpMessageHeaders* (advanced) | If this option is true then IN exchange Headers of the exchange will be mapped to HTTP headers. Setting this to false will avoid the HTTP Headers mapping. | true | boolean
| *setHttpResponseDuring Processing* (advanced) | Sets the flag to use the endpoint where you can either populate camel exchange from servlet response or use request itself which may be thought as if it is a proxy. |  | Boolean
| *skipServletProcessing* (advanced) | Sets the flag to use skip servlet processing and let camel take over processing |  | Boolean
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
| *useSystemProperties* (advanced) | To use System Properties as fallback for configuration | false | boolean
| *proxyClientClass* (proxy) | Sets the resteasy proxyClientClass |  | String
| *password* (security) | Sets the password |  | String
| *username* (security) | Sets the username |  | String
|===
// endpoint options: END

=== Usage

Consumer endpoints are similar to endpoints generated by the Servlet component.
Therefore, it should be used only as input into your Camel routes. To
issue HTTP requests against other HTTP endpoints, use the
xref:http-component.adoc[HTTP Component].

Producer endpoints rely on Resteasy Client API. https://docs.jboss.org/resteasy/docs/4.5.3.Final/userguide/html_single/index.html#RESTEasy_Client_Framework

== Putting Camel JARs in the app server boot classpath
Refer same section of  xref:servlet-component.adoc[Servlet Component].

== Sample

As a basic consumer with Spring example, first, you need to publish the servlet 
using  the `Web.xml` file to publish


Notice that below two listeners are registered when application server is initialized.
The org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap class is a ServletContextListener that configures an instance of an ResteasyProviderFactory and Registry. You can obtain instances of a ResteasyProviderFactory and Registry from the ServletContext attributes org.jboss.resteasy.spi.ResteasyProviderFactory and org.jboss.resteasy.spi.Registry. From these instances you can programmatically interact with RESTEasy registration interfaces.
Please note that the SpringContextLoaderListener must be declared after ResteasyBootstrap as it uses ServletContext attributes initialized by it. 
For further details please refer to https://docs.jboss.org/resteasy/docs/4.5.3.Final/userguide/html_single/index.html#RESTEasy_Spring_Integration


[source,xml]
-------------------------------------------------------------------------
<web-app>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>

    <listener>
        <listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>resteasy-camel-servlet</servlet-name>
        <servlet-class>org.apache.camel.component.resteasy.servlet.ResteasyCamelServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>resteasy-camel-servlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>
-------------------------------------------------------------------------

Then you can define your route as follows:

[source,xml]
-------------------------------------------------------------------------
<context:component-scan base-package="org.apache.camel.component.resteasy.test">
    <context:include-filter type="annotation" expression="javax.ws.rs.Path"/>
</context:component-scan>

    ........

<camel:camelContext>

    <camel:route>
        <camel:from uri="resteasy:/customer/getAll?servletName=resteasy-camel-servlet"/>
        <camel:to uri="file://target/test/consumerTest?fileName=all.txt"/>
    </camel:route>

 </camel:camelContext>
-------------------------------------------------------------------------

Notice that component-scan is important to load resteasy servlet properly into container's runtime.

include::camel-spring-boot::page$resteasy-starter.adoc[]
