Extend apache web server to support custom redirect API

I need an extension to apache web server that is able to hook into the apache processing pipeline, send data of the incoming request to an remote http-based API and process the result. The API will answer with a JSON body that has to be interpreted. Part of the JSON body is the information whether a http-redirect has to be issued based on the incoming url. If this part is available, the extension has to issue a http-redirect and stop the processing of the incoming url. The remote API requires a POST request in JSON format with the following data of the actual incoming request: - URL - IPAddress - UserAgent - all HTTP Headers as a key-value section The extension will receive a JSON result from the API that includes the following information: - IsRedirect:boolean - IsTemporary:boolean - Url:string - HttpHeaders:Key/Value structure If IsRedirect:boolean==false, the extension should just let apache continue with normal processing. If IsRedirect:boolean==true, the IsTemporary:boolean and Url:string fields will contain values. The Url field defines to which Url to redirect. IsTemporary:boolean defines if the redirect should be 301 or 302. If the HttpHeaders:Key section is available (it is optional) then all entries should be set as HttpHeaders.