IMHO, you'd probably get better traction with such questions in a  
wider audience on the main scala-user list over at EPFL...

Cheers, Tim


On 8 Sep 2009, at 17:26, Jack Widman wrote:

> Right. I will try to keep to the topic :)
>
> I actually found him and he quickly answered me.
>
> On Tue, Sep 8, 2009 at 12:24 PM, David Pollak <feeder.of.the.be...@gmail.com 
> > wrote:
> Jack,
>
> I'm not sure where N8han (the author of Databinder) hangs out, but  
> it's not on the Lift list.  :-(
>
> Sorry.
>
> David
>
>
> On Tue, Sep 8, 2009 at 8:58 AM, jack <jack.wid...@gmail.com> wrote:
>
> Please forgive me for including so much code but I have an important
> demo fast approaching and I'm kind of in a bind. I am using
> Databinders Dispatch http library which is a wrapper around Javas
> HttpClient library. I have included the Http class below. Does anyone
> see how to set the user-agent header. Once again I apologize and would
> be much obliged for any help.
>
> import collection.Map
> import collection.immutable.{Map => IMap}
> import util.DynamicVariable
> import java.io.
> {InputStream,OutputStream,BufferedInputStream,BufferedOutputStream}
> import java.net.URI
> import java.util.zip.GZIPInputStream
>
> import org.apache.http._
> import org.apache.http.client._
> import org.apache.http.impl.client.{DefaultHttpClient,
> BasicCredentialsProvider}
> import org.apache.http.client.methods._
> import org.apache.http.client.entity.UrlEncodedFormEntity
> import org.apache.http.client.utils.URLEncodedUtils
>
> import org.apache.http.entity.StringEntity
> import org.apache.http.message.BasicNameValuePair
> import org.apache.http.protocol.HTTP.UTF_8
> import org.apache.http.params.{HttpProtocolParams, BasicHttpParams}
> import org.apache.http.util.EntityUtils
> import org.apache.http.auth.{AuthScope, UsernamePasswordCredentials,
> Credentials}
>
> case class StatusCode(code: Int, contents:String)
>  extends Exception("Exceptional resoponse code: " + code + "\n" +
> contents)
>
> /** Http access point. Standard instances to be used by a single
> thread. */
> class Http {
>  val credentials = new DynamicVariable[Option[(AuthScope,
> Credentials)]](None)
>  val client = new ConfiguredHttpClient
>
>  def credentialsProvider = new BasicCredentialsProvider {
>    override def getCredentials(scope: AuthScope) = null
>  }
>
> /**  /** Info Logger for this instance, default returns Connfiggy if
> on classpath else console logger. */
>  lazy val log: Logger = try {
>    new Logger {
>      val delegate = net.lag.logging.Logger.get
>      def info(msg: String, items: Any*) { delegate.info(msg, items:
> _*) }
>    }
>  } catch {
>    case e: NoClassDefFoundError => new Logger {
>      def info(msg: String, items: Any*) {
>        println("INF: [console logger] dispatch: " + msg.format(items:
> _*))
>      }
>    }
>  }
>  **/
>  /** Execute method for the given host, with logging. */
>  def execute(host: HttpHost, req: HttpUriRequest) = {
>    //log.info("%s %s%s", req.getMethod, host, req.getURI)
>    client.execute(host, req)
>  }
>  /** Execute for given optional parametrs, with logging. Creates
> local scope for credentials. */
>  val execute: (Option[HttpHost], Option[Credentials], HttpUriRequest)
> => HttpResponse = {
>    case (Some(host), Some(creds), req) =>
>      client.credentials.withValue(Some((new AuthScope
> (host.getHostName, host.getPort), creds)))(execute(host, req))
>    case (None, Some(creds), _) => error("Credentials specified
> without explicit host")
>    case (Some(host), _, req) => execute(host, req)
>    case (_, _, req) =>
>      //log.info("%s %s", req.getMethod, req.getURI)
>      client.execute(req)
>  }
>  /** Execute full request-response handler. */
>  def x[T](hand: Handler[T]): T = x(hand.request)(hand.block)
>  /** Execute request and handle response codes, response, and entity
> in block */
>  def x [T](req: Request)(block: Handler.F[T]) = {
>    val res = execute(req.host, req.creds, req.req)
>    val ent = res.getEntity match {
>      case null => None
>      case ent => Some(ent)
>    }
>    try { block(res.getStatusLine.getStatusCode, res, ent) }
>    finally { ent foreach (_.consumeContent) }
>  }
>  /** Apply Response Handler if reponse code returns true from chk. */
>  def when[T](chk: Int => Boolean)(hand: Handler[T]) = x(hand.request)
> {
>    case (code, res, ent) if chk(code) => hand.block(code, res, ent)
>    case (code, _, Some(ent)) => throw StatusCode(code,
> EntityUtils.toString(ent, UTF_8))
>    case (code, _, _)         => throw StatusCode(code, "[no entity]")
>  }
>  /** Apply a custom block in addition to predefined response Handler.
> */
>  def also[A,B](hand: Handler[B])(block: Handler.F[A]) =
>    x(hand.request) { (code, res, ent) => ( hand.block(code, res,
> ent), block(code, res, ent) ) }
>
>  /** Apply handler block when response code is 200 - 204 */
>  def apply[T](hand: Handler[T]) = (this when {code => (200 to 204)
> contains code})(hand)
> }
>
> /** Nil request, useful to kick off a descriptors that don't have a
> factory. */
> object /\ extends Request(None, None, Nil)
>
> /* Factory for requests from a host */
> object :/ {
>  def apply(hostname: String, port: Int): Request =
>    new Request(Some(new HttpHost(hostname, port)), None, Nil)
>
>  def apply(hostname: String): Request = new Request(Some(new HttpHost
> (hostname)), None, Nil)
> }
>
> /** Factory for requests from a directory, prepends '/'. */
> object / {
>  def apply(path: String) = /\ / path
> }
>
> object Request {
>  /** Request transformer */
>  type Xf = HttpRequestBase => HttpRequestBase
>  /** Updates the request URI with the given string-to-string
> function. (mutates request) */
>  def uri_xf(sxf: String => String)(req: HttpRequestBase) = {
>    req.setURI(URI.create(sxf(req.getURI.toString)))
>    req
>  }
> }
>
> /** Request handler, contains request descriptor and a function to
> transform the result. */
> case class Handler[T](request: Request, block: Handler.F[T]) extends
> Handlers {
>  /** Create a new handler with block that receives all response
> parameters and
>      this handler's block converted to parameterless function. */
>  def apply[R](next: (Int, HttpResponse, Option[HttpEntity], () => T)
> => R) =
>    new Handler(request, {(code, res, ent) =>
>      next(code, res, ent, () => block(code, res, ent))
>    })
> }
>
> object Handler {
>  type F[T] = (Int, HttpResponse, Option[HttpEntity]) => T
>  /** Turns a simple entity handler in into a full response handler
> that fails if no entity */
>  def apply[T](req: Request, block: HttpEntity => T): Handler[T] =
>    Handler(req, { (code, res, ent) => ent match {
>      case Some(ent) => block(ent)
>      case None => error("response has no entity: " + res)
>    } } )
> }
>
> class Post(val values: Map[String, Any]) extends HttpPost {
>  this setEntity new UrlEncodedFormEntity(Http.map2ee(values), UTF_8)
> }
>
> /** Request descriptor, possibly contains a host, credentials, and a
> list of transformation functions. */
> class Request(val host: Option[HttpHost], val creds: Option
> [Credentials], val xfs: List[Request.Xf]) extends Handlers {
>
>  /** Construct with path or full URI. */
>  def this(str: String) = this(None, None, Request.uri_xf(cur => cur +
> str)_ :: Nil)
>
>  /** Construct as a clone, e.g. in class extends clause. */
>  def this(req: Request) = this(req.host, req.creds, req.xfs)
>
>  def next(xf: Request.Xf) = new Request(host, creds, xf :: xfs)
>  def next_uri(sxf: String => String) = next(Request.uri_xf(sxf))
>
>  def mimic(dest: HttpRequestBase)(req: HttpRequestBase) = {
>    dest.setURI(req.getURI)
>    dest.setHeaders(req.getAllHeaders)
>    dest
>  }
>
>  // The below functions create new request descriptors based off of
> the current one.
>  // Most are intended to be used as infix operators; those that don't
> take a parameter
>  // have character names to be used with dot notation, e.g. /:
> ("example.com").HEAD.secure >>> {...}
>
>  /** Set credentials to be used for this request; requires a host
> value :/(...) upon execution. */
>  def as (name: String, pass: String) =
>    new Request(host, Some(new UsernamePasswordCredentials(name,
> pass)), xfs)
>
>  /** Convert this to a secure (scheme https) request if not already
> */
>  def secure = new Request(host map {
>    h => new HttpHost(h.getHostName, h.getPort, "https") // default
> port -1 works for either
>  } orElse { error("secure requires an explicit host") }, creds, xfs)
>
>  /** Combine this request with another. */
>  def <& (req: Request) = new Request(host orElse req.host, creds
> orElse req.creds, req.xfs ::: xfs)
>
>  /** Combine this request with another handler. */
>  def >& [T] (other: Handler[T]) = new Handler(this <& other.request,
> other.block)
>
>  /** Append an element to this request's path, joins with '/'.
> (mutates request) */
>  def / (path: String) = next_uri { _ + "/" + path }
>
>  /** Add headers to this request. (mutates request) */
>  def <:< (values: Map[String, String]) = next { req =>
>    values foreach { case (k, v) => req.addHeader(k, v) }
>    req
>  }
>
>  /* Add a gzip acceptance header */
>  def gzip = this <:< IMap("Accept-Encoding" -> "gzip")
>
>  /** Put the given object.toString and return response wrapper. (new
> request, mimics) */
>  def <<< (body: Any) = next {
>    val m = new HttpPut
>    m setEntity new StringEntity(body.toString, UTF_8)
>    HttpProtocolParams.setUseExpectContinue(m.getParams, false)
>    mimic(m)_
>  }
>  /** Post the given key value sequence and return response wrapper.
> (new request, mimics) */
>  def << (values: Map[String, Any]) = next { mimic(new Post(values))
> _ }
>
>  /** Add query parameters. (mutates request) */
>  def <<? (values: Map[String, Any]) = next_uri { uri =>
>    if (values.isEmpty) uri
>    else uri + (
>      if (uri contains '?') '&' + Http.q_str(values) else (Http ?
> values)
>    )
>  }
>
>  // generators that change request method without adding parameters
>
>  /** HTTP post request. (new request, mimics) */
>  def POST = next { mimic(new Post(IMap.empty))_ }
>
>  /** HTTP delete request. (new request, mimics) */
>  def DELETE = next { mimic(new HttpDelete)_ }
>
>  /** HTTP head request. (new request, mimics). See >:> to access
> headers. */
>  def HEAD = next { mimic(new HttpHead)_ }
>
>  // end Request generators
>
>  /** Builds underlying request starting with a blank get and applying
> transformers right to left. */
>  lazy val req = {
>    val start: HttpRequestBase = new HttpGet("")
>    (xfs :\ start) { (a,b) => a(b) }
>  }
>
>  /** @return URI based on this request, e.g. if needed outside
> Disptach. */
>  def to_uri = Http.to_uri(host, req)
>
>  /** Use this request for trait Handlers */
>  val request = this
> }
> trait Handlers {
>  /** the below functions produce Handlers based on this request
> descriptor */
>  val request: Request
>
>  /** Handle InputStream in block, handle gzip if so encoded. */
>  def >> [T] (block: InputStream => T) = Handler(request, { ent =>
> block (
>    if(ent.getContentEncoding != null &&
> ent.getContentEncoding.getValue == "gzip")
>      new GZIPInputStream(ent.getContent)
>    else ent.getContent
>  ) } )
>  /** Handle some non-huge response body as a String, in a block. */
>  def >- [T] (block: String => T) = >> { stm => block
> (scala.io.Source.fromInputStream(stm).mkString) }
>  /** Return some non-huge response as a String. */
>  def as_str = >- { s => s }
>  /** Write to the given OutputStream. */
>  def >>> [OS <: OutputStream](out: OS) = Handler(request, { ent =>
> ent.writeTo(out); out })
>  /** Process response as XML document in block */
>  def <> [T] (block: xml.Elem => T) = >> { stm => block(xml.XML.load
> (stm)) }
>
>  /** Process header as Map in block. Map returns empty set for header
> name misses. */
>  def >:> [T] (block: IMap[String, Set[String]] => T) =
>    Handler(request, (_, res, _) =>
>      block((IMap[String, Set[String]]().withDefaultValue(Set()) /:
> res.getAllHeaders) {
>        (m, h) => m + (h.getName -> (m(h.getName) + h.getValue))
>      } )
>    )
>
>  /** Ignore response body. */
>  def >| = Handler(request, (code, res, ent) => ())
>
>  /** Split into two request handlers, return results of each in
> tuple. */
>  def >+ [A, B] (block: Handlers => (Handler[A], Handler[B])) = {
>    new Handler[(A,B)] ( request, { (code, res, opt_ent) =>
>      val (a, b) = block(new Handlers { val request = /\ })
>      (a.block(code, res, opt_ent), b.block(code,res,opt_ent))
>    } )
>  }
> }
>
> /** Basic extension of DefaultHttpClient defaulting to Http 1.1, UTF8,
> and no Expect-Continue.
>    Scopes authorization credentials to particular requests thorugh a
> DynamicVariable. */
> class ConfiguredHttpClient extends DefaultHttpClient {
>  override def createHttpParams = {
>    val params = new BasicHttpParams
>    HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1)
>    HttpProtocolParams.setContentCharset(params, UTF_8)
>    HttpProtocolParams.setUseExpectContinue(params, false)
>    params
>  }
>  val credentials = new DynamicVariable[Option[(AuthScope,
> Credentials)]](None)
>  setCredentialsProvider(new BasicCredentialsProvider {
>    override def getCredentials(scope: AuthScope) = credentials.value
> match {
>      case Some((auth_scope, creds)) if scope.`match`(auth_scope) >= 0
> => creds
>      case _ => null
>    }
>  })
> }
>
> /** Used by client APIs to build Handler or other objects via
> chaining, completed implicitly.
>  * @see Http#builder2product */
> trait Builder[T] { def product:T }
>
> /** May be used directly from any thread. */
> object Http extends Http {
>  import org.apache.http.conn.scheme.
> {Scheme,SchemeRegistry,PlainSocketFactory}
>  import org.apache.http.conn.ssl.SSLSocketFactory
>  import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager
>
>  /** import to support e.g. Http("http://example.com/"; >>>
> System.out) */
>  implicit def str2req(str: String) = new Request(str)
>
>  implicit def builder2product[T](builder: Builder[T]) =
> builder.product
>
>  override val client = new ConfiguredHttpClient {
>    override def createClientConnectionManager() = {
>      val registry = new SchemeRegistry()
>      registry.register(new Scheme("http",
> PlainSocketFactory.getSocketFactory(), 80))
>      registry.register(new Scheme("https",
> SSLSocketFactory.getSocketFactory(), 443))
>      new ThreadSafeClientConnManager(getParams(), registry)
>    }
>  }
>  /** Shutdown connection manager, threads. (Needed to close console
> cleanly.) */
>  def shutdown() = client.getConnectionManager.shutdown()
>
>  /** Convert repeating name value tuples to list of pairs for
> httpclient */
>  def map2ee(values: Map[String, Any]) = java.util.Arrays asList (
>    values.toSeq map { case (k, v) => new BasicNameValuePair(k,
> v.toString) } toArray : _*
>  )
>  /** @return %-encoded string for use in URLs */
>  def % (s: String) = java.net.URLEncoder.encode(s, UTF_8)
>
>  /** @return %-decoded string e.g. from query string or form body */
>  def -% (s: String) = java.net.URLDecoder.decode(s, UTF_8)
>
>  /** @return formatted and %-encoded query string, e.g.
> name=value&name2=value2 */
>  def q_str (values: Map[String, Any]) = URLEncodedUtils.format(map2ee
> (values), UTF_8)
>
>  /** @return formatted query string prepended by ? unless values map
> is empty  */
>  def ? (values: Map[String, Any]) = if (values.isEmpty) "" else "?" +
> q_str(values)
>
>  /** @return URI built from HttpHost if present combined with a
> HttpClient request object. */
>  def to_uri(host: Option[HttpHost], req: HttpRequestBase) =
>    URI.create(host.map(_.toURI).getOrElse("")).resolve(req.getURI)
> }
>
>
>
>
>
> -- 
> Lift, the simply functional web framework http://liftweb.net
> Beginning Scala http://www.apress.com/book/view/1430219890
> Follow me: http://twitter.com/dpp
> Git some: http://github.com/dpp
>
>
>
>
> >


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