HTTP headers

Request header

Our OpenRTB An open industry standard for communication between buyers and sellers of online advertising in real-time bidding auctions. It's published by the IAB. bidding API uses HTTP 1.1 protocol and sends the following request headers:

Attribute Scope Description
Connection Required The connection type for the request. We accept "Keep-Alive".
Content-Length Required The size of the request.
Content-Type Required The content type for the request. This value is always "application/json".
Host Required The domain of the bidding URL.
x-openrtb-version Required

The version of OpenRTB protocol used for the request. Index defaults to sending "2.6", unless a DSP Demand-Side Platform (DSP). A software platform that automates bidding decisions in real-time and efficiently connects buyers and audiences through an ad exchange or SSP. Also known as a buy-side platform. is not capable of receiving that value. OpenRTB bid requests are backward compatible with OpenRTB 2.5 requests.

Note: While we send "2.6" as the default value, Index currently only supports the functionality associated with a subset of OpenRTB 2.6 fields, as documented in our List of supported OpenRTB bid request fields for DSPs. Support for additional fields is ongoing. For more information on supported OpenRTB 2.6 fields as they are released, see our Release Notes.

Content-Encoding: gzip

Required

Specifies that the payload in the request body utilizes gzip compression. For more information about gzip, see Send and receive compressed traffic using gzip.

Response header

The Index OpenRTB bidding API uses HTTP 1.1 protocol and sends the following response headers:

Attribute Scope Description

Content-Length

Optional

Specifies the size of the response.

Connection

Optional

The connection is closed after processing the request if the value is "close". Otherwise, the connection is reused for the following request.

No-bid signal

To express a "no-bid", you may return an empty bid response An OpenRTB response that is sent by the DSP in response to the SSP's or ad exchange's bid request. It is an event directed back to the seller expressing a valuation for the request and conditions of sale. with HTTP Status Code 204 "No Content".