formFieldSeqformFieldList

def formFieldSeq: Directive1[immutable.Seq[(String, String)]]

Description

Extracts all HTTP form fields at once in the original order as (name, value) tuples of type (String, String)Map.Entry<String, String>. Data posted from HTML Forms is either of type application/x-www-form-urlencoded or of type multipart/form-data.

This directive can be used if the exact order of form fields is important or if parameters can occur several times.

See formFields for an in-depth description.

Warning

The directive reads all incoming HTTP form fields without any configured upper bound. It means, that requests with form fields holding significant amount of data (ie. during a file upload) can cause performance issues or even an OutOfMemoryError s.

Example

Scala

copysourceval route =
  formFieldSeq { fields =>
    def formFieldString(formField: (String, String)): String =
      s"""${formField._1} = '${formField._2}'"""
    complete(s"The form fields are ${fields.map(formFieldString).mkString(", ")}")
  }

// tests:
Post("/", FormData("color" -> "blue", "count" -> "42")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are color = 'blue', count = '42'"
}
Post("/", FormData("x" -> "23", "x" -> "4", "x" -> "89")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are x = '23', x = '4', x = '89'"
}

Java

copysourceimport static akka.http.javadsl.server.Directives.complete;
import static akka.http.javadsl.server.Directives.formFieldList;

final Function<List<Entry<String, String>>, String> listToString = list ->
  list.stream()
    .map(e -> e.getKey() + " = '" + e.getValue() +"'")
    .collect(Collectors.joining(", "));

final Route route = formFieldList(fields ->
  complete("The form fields are " + listToString.apply(fields))
);

// tests:
final FormData formDataDiffKey =
  FormData.create(
    Pair.create("color", "blue"),
    Pair.create("count", "42"));
testRoute(route).run(HttpRequest.POST("/").withEntity(formDataDiffKey.toEntity()))
  .assertEntity("The form fields are color = 'blue', count = '42'");

final FormData formDataSameKey =
  FormData.create(
    Pair.create("x", "23"),
    Pair.create("x", "4"),
    Pair.create("x", "89"));
testRoute(route).run(HttpRequest.POST("/").withEntity(formDataSameKey.toEntity()))
  .assertEntity("The form fields are x = '23', x = '4', x = '89'");