简书链接:fidder修改请求响应的2种方法
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static function OnPeekAtResponseHeaders(oSession: Session) {
    //FiddlerApplication.Log.LogFormat("Session {0}: Response header peek shows status is {1}", oSession.id, oSession.responseCode);
    if (m_DisableCaching) {
        oSession.oResponse.headers.Remove("Expires");
        oSession.oResponse["Cache-Control"] = "no-cache";
    }

    if ((bpStatus>0) && (oSession.responseCode == bpStatus)) {
        oSession["x-breakresponse"]="status";
        oSession.bBufferResponse = true;
    }
    
    if ((null!=bpResponseURI) && oSession.uriContains(bpResponseURI)) {
        oSession["x-breakresponse"]="uri";
        oSession.bBufferResponse = true;
    }
    if (oSession.HostnameIs("lozn.free.idcfengye.com")){ 
        // && oSession.oResponse.headers.ExistsAndContains("Content-Type","text/html")){
        oSession.bBufferResponse = true;    //需要在返回头这里就设置buffer处理，否则，后续无法在onBeforeResponse中修改body（修改的动作不会阻塞原来的返回）
    }

} 

static function OnBeforeResponse(oSession: Session) {
    if (m_Hide304s && oSession.responseCode == 304) {
        oSession["ui-hide"] = "true";
    }
 
    if (oSession.HostnameIs("lozn.free.idcfengye.com") && oSession.oResponse.headers.ExistsAndContains("Server","Kestrel")){
        oSession.utilDecodeResponse();

       oSession.utilReplaceInResponse("code","code\"=1,\"before");

      oSession.utilReplaceInResponse('Content-Security-Policy','');

    }
}

方法2

Fiddler-> Rules-> Automatic Breakpoints，点击【Before Responses】。