Sends user input (text-only) to Amazon Lex. Client applications can use this API to send requests to Amazon Lex at runtime. Amazon Lex then interprets the user input using the machine learning model it built for the bot.
In response, Amazon Lex returns the next
message to convey to the user
responseCard to display. Consider the following example messages:
For a user input "I would like a pizza", Amazon Lex might return a response with a message eliciting slot data (for example, PizzaSize): "What size pizza would you like?"
After the user provides all of the pizza order information, Amazon Lex might return a response with a message to obtain user confirmation "Proceed with the pizza order?".
After the user replies to a confirmation prompt with a "yes", Amazon Lex might return a conclusion statement: "Thank you, your cheese pizza has been ordered.".
Not all Amazon Lex messages require a user response. For example, a conclusion statement
does not require a response. Some messages require only a "yes" or "no" user response.
In addition to the
message, Amazon Lex provides additional context about
the message in the response that you might use to enhance client behavior, for example,
to display the appropriate client user interface. These are the
slots fields in
the response. Consider the following examples:
If the message is to elicit slot data, Amazon Lex returns the following context information:
dialogState set to ElicitSlot
intentName set to the intent name in the current context
slotToElicit set to the slot name for which the
is eliciting information
slots set to a map of slots, configured for the intent, with currently
If the message is a confirmation prompt, the
dialogState is set to ConfirmIntent
SlotToElicit is set to null.
If the message is a clarification prompt (configured for the intent) that indicates
that user intent is not understood, the
dialogState is set to ElicitIntent
slotToElicit is set to null.
In addition, Amazon Lex also returns your application-specific
For more information, see Managing
For PCL this operation is only available in asynchronous form. Please refer to PostTextAsync.
public virtual PostTextResponse PostText( PostTextRequest request )
Container for the necessary parameters to execute the PostText service method.
|BadGatewayException||Either the Amazon Lex bot is still building, or one of the dependent services (Amazon Polly, AWS Lambda) failed with an internal service error.|
|BadRequestException||Request validation failed, there is no usable message in the context, or the bot build failed, is still in progress, or contains unbuilt changes.|
|ConflictException||Two clients are using the same AWS account, Amazon Lex bot, and user ID.|
|DependencyFailedException||One of the dependencies, such as AWS Lambda or Amazon Polly, threw an exception. For example, If Amazon Lex does not have sufficient permissions to call a Lambda function. If a Lambda function takes longer than 30 seconds to execute. If a fulfillment Lambda function returns a Delegate dialog action without removing any slot values.|
|InternalFailureException||Internal service error. Retry the call.|
|LimitExceededException||Exceeded a limit.|
|LoopDetectedException||This exception is not used.|
|NotFoundException||The resource (such as the Amazon Lex bot or an alias) that is referred to is not found.|
Supported in: 4.5, 4.0, 3.5
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms