Abstract: Dynamic header bidding configuration is disclosed. For example, ad slot entries associated with ad slots in a web content, further associated with ad identifiers and ad sizes are received. Header bidding partners associated with an ad slot entry are received, each partner associated with a parameter. The partners, parameters, ad slot entries, ad identifiers, and ad sizes are recorded as a configuration associated with the web content. A script associated with the configuration, further associated with a page of the web content including an ad slot associated with the ad slot entry is generated. The configuration is sent to a client device that invokes the script by loading the first page, and an ad from a partner is displayed in an ad impression of the ad slot on the client device based on a response to a notice sent to at least two partners.