[Set response headers on Chrome extensions API]

onHeadersReceived.js

    chrome.webRequest.onHeadersReceived.addListener(//For getting responses : use onHeadersReceived Event
      callback, 
      {
        urls: ["<all_urls>"],
        types: ["xmlhttprequest"],
      },
      ["blocking", "responseHeaders"]// For response event use ["blocking", "responseHeaders"] filters and return {responseHeaders: details.responseHeaders}; to block and modify requests
    );

function callback(details){
details.responseHeaders.find((headerType,index) => {
      console.log(headerType)
      if(headerType.name == 'status'){
          headerType.value = '404'
      }
      if(headerType.name === "content-type"){
        headerType.value = ""
      }
      if(headerType.name === "pragma"){
        headerType.value = ""
      }
      if(headerType.name === "expires"){
        headerType.value = ""
      }
    })

    return { responseHeaders: details.responseHeaders };
}