Just like the HttpServer the HttpClient supports sending chunked requests as well as receiving chunked responses in an asynchronous fashion. The scaladoc API documentation of the HttpConnection trait should be rather self-explanatory with regard to its usage.

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You can pass a ServerConfig instance to the HttpServer constructor. If you don't spray-can looks for a server configuration in your applications akka.conf file and uses default settings for anything not specified there. By default your service actor needs to have the id spray-root-service in order to be found by the HttpServer. After being started the server actor will accept new HTTP connections on the configured host interface (and port) and dispatch all incoming HTTP requests as RequestContext messages to your service actor. You can take a look at the server-examples TestService implementation for some example of what basic request handling with spray-can might look like.

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The spray-can HttpClient is the natural counterpart of the HttpServer. It shares all core features as well as the basic "low-level" philosophy with the server.

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A low-overhead, high-performance, fully async HTTP 1.1 server and client library implemented entirely in Scala on top of Akka

The spray-can HTTP server is really easy to use. All you need to do is start a new HttpServer actor as well as an actor holding your custom request handling logic. Ideally these actors should be supervised:

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Your HttpResponse instances must not include explicit Content-Length, Transfer-Encoding or Date headers, since spray-can sets these automatically.

HTTP pipelining is fully supported and completely transparent to your application. I.e. the client is allowed to send a whole sequence of requests in a row without first waiting for responses. The spray-can HttpServer dispatches such pipelined requests to your service actor just as any other. However, since in many asynchronous applications response times can be somewhat undeterministic spray-can will take care of properly ordering all responses coming in from your application before sending them out to "the wire". I.e. your application will "see" requests in the order they are coming in but is not required to uphold this order when generating responses.

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If configured with a non-zero requestTimeout setting the spray-can HttpServer will watch for request timeouts. If your application logic does not complete a request by either calling responder.complete or responder.startChunkedResponse on the incoming RequestContext within the configured timeout period the HttpServer dispatches a Timeout message to the configured timeout actor (which may well be identical to your service actor). The application then has another chance to complete the request, this time within the configured timeoutTimeout period. Only if the request is still uncompleted after this time period the HttpServer will complete the request itself with the result from its timeoutTimeoutResponse method (which you may override should the need arise).

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When the spray-can HttpServer receives the first bits of a chunked request from a client it starts a new Akka actor for handling the different parts of the request. The ServerConfig contains a streamActorCreator member which can hold a custom function performing the actual actor creation. spray-can takes care of properly starting and stopping the actor your custom function created as well as dispatching MessageChunk and ChunkedRequestEnd messages to it. If you do not supply a custom streamActorCreator spray-can uses a BufferingRequestStreamActor for incoming chunked requests to transparently buffer and assemble regular HttpResponse instances before dispatching them to the regular service actor.

Your application can decide to respond to a request with a chunked response rather than a "traditional" one. This is done via the startChunkedResponse method of the responder member of the incoming RequestContext. This method returns a ChunkedResponder that allows for the sending of the individual message chunks as well as finalization of the response.

The best way to shut down a spray-can HTTP client instance is to send it an Akka PoisonPill message. This will ensure the proper closing of all open connections as well as the freeing all other occupied resources. Simply stopping the HttpClient actor by calling stop() (or Actor.registry.shutdownAll()) can sometimes lead to the client thread not properly terminating.

If configured with a non-zero requestTimeout setting the spray-can HttpClient will watch for request timeouts. If the server does not respond within the configured timeout period a respective HttpClientException instance will be created and delivered to either the receiver actor or the response future. Additionally the HttpClient will automatically close idle connections if the configured idleTimeout is non-zero.

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The spray-can HttpServer is implemented as an Akka actor running on a single, private thread managing a Java NIO selector. Incoming HTTP requests are dispatched as immutable messages to a service actor provided by the application. Requests are completed by calling a responder function passed along (in continuation style) with the request message.

Feedback and contributions to the project, no matter what kind, are always very welcome. However, patches can only be accepted from their original author. Along with any patches, please state that the patch is your original work and that you license the work to the spray-can project under the project’s open source license.

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When sending out responses the server watches for a Connection header that your application might set and acts accordingly. I.e. you can force spray-can to close the connection after having sent the response by including an HttpHeader("Connection", "close"). To unconditionally force a connection keep-alive you can explicitly set a HttpHeader("Connection", "Keep-Alive") header. If you don't set an explicit Connection header the server will keep the connection alive if the client supports this (i.e. it either sent a "Connection: Keep-Alive" header or specified HTTP/1.1 capabilities without sending a "Connection: close" header).

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The National Interagency Fire Center is committed to making its information and communication technologies accessible to individuals with disabilities by meeting or exceeding the requirements of Section 508 of the Rehabilitation Act of 1973, as amended. To meet this commitment, we continue to monitor and update our content to make sure our documents meet these standards.

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Note that the explicit result type annotations are only shown here for documentation. They can be inferred and are therefore not required.

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If you know that the HTTP server your application connects to supports request pipelining you can send several requests in a row without first waiting for responses to come in. The HttpDialog DSL (see below) might make working with persistant connections and request pipelinging a bit easier.

If the ServerConfig has a non-zero idleTimeout the HttpServer will close idle connections after the respective time period.

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As a thin layer on top of the HttpClient spray-can provides a convenience mini-DSL that makes working with HTTP connections a bit easier. It is probably best explained by example.

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HTTP/1.1 defines the "chunked" transfer encoding for HTTP messages (requests and responses), which allows for the sending of very large (even "infinite") HTTP requests or responses. Normally the client or server sending an HTTP message needs to know the size of the message before sending it. Chunked transfer encoding removes this requirement, i.e. the client or server can start sending the message before the complete length is known (which might be useful when transferring things like a live video or audio stream).

spray-can is available from the repo.spray.cc repository. The latest release is 0.9.3 and is built against Scala 2.9.1 and Akka 1.3.1.

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This repository contains the sources of an older version of spray-can (targeted at Scala 2.9.x and Akka 1.3.x). If you are looking for the latest version please turn to the main spray site at http://spray.io.

As you can see from this API the spray-can HttpClient works on the basis of individual connections. There is no higher-level support for automatic connection pooling and such, since this is considered the responsibility of the next-higher application layer.

The easiest way to get started with spray-can is to try out the server-example and/or the client-example that's part of the spray-can codebase:

You can pass a ClientConfig instance to the HttpClient constructor. If you don't spray-can looks for a client configuration in your applications akka.conf file and uses default settings for anything not specified there. After being started the client actor will wait for Connect messages from your application, which it responds with an object implementing the HttpConnection trait. Its scaladoc API documentation should give you a pretty good idea of how to use an HttpConnection instance for sending requests and receive responses.

spray-can is a low-overhead, high-performance, fully asynchronous HTTP 1.1 server and client library implemented entirely in Scala on top of Akka.

The best way to shut down a spray-can HTTP server instance is to send it an Akka PoisonPill message. This will ensure the proper closing of all open connections as well as the freeing all other occupied resources. Simply stopping the HttpServer actor by calling stop() (or Actor.registry.shutdownAll()) can sometimes lead to the server thread not properly terminating.

A low-overhead, high-performance, fully async HTTP 1.1 server and client library implemented entirely in Scala on top of Akka

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The spray-can server always passes all received headers on to your application. Additionally the values of the following request headers are interpreted by the server itself:

Just like the HttpServer the HttpClient is implemented as an Akka actor running on a single, private thread. So, in order to use it you first need to create and start it:

All non-core features of typical HTTP servers (like request routing, file serving, compression, etc.) are left to the next layer in the application stack, they are not implemented by spray-can itself. Apart from general focus this design keeps spray-can small and light-weight as well as easy to understand and to maintain. It also makes a spray-can HttpServer a perfect "container" for a spray-server application, since spray-can and spray-server nicely complement and interface into each other. spray-server supports spray-can HttpServer out of the box.

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