回答編集履歴
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追記追加
test
CHANGED
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@@ -27,3 +27,269 @@
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（根本的にやり方を変えないとダメということになりそうな気がします）
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----- 2017/6/29 16:34 追記 -----
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下の 2017/06/29 15:48 の私のコメントで「自分の環境と検証に使ったコードその他の情報を回答欄に書いておきます」と書きましたが、それを以下に書いておきます。
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**環境：**
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Visual Studio Commnuty 2015 Update 3
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ASP.NET Web Forms（Web サイトプロジェクトとして作成、IIS のサイトに設定）
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.NET Framework 4.6.1
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Windows 10 Pro 64-bit, 10.0.14393 ビルド 14393
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IIS 10.0, CLR v4.0, 64-bit, 統合パイプラインモード
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IE11 ver. 11.1358.14393.0 更新 ver. 11.0.43 (KB4021558)
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**ソースコード**
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**base.aspx **に該当するもの。コードビハインド形式にせず一体にしています。
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```
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<%@ Page Language="C#" %>
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<!DOCTYPE html>
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<script runat="server">
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</script>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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<script src="/Scripts/jquery-1.10.2.js"></script>
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<script type="text/javascript">
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//<![CDATA[
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$(function () {
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$('#btn_ok').click(function () {
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window.open('0008-out.aspx', '_blank');
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});
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$('#btn_dame').click(function () {
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window.open('', 'report');
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var form = $('<form/>', {
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id: 'rpt_p',
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action: '0008-out.aspx',
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target: 'report',
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method: 'post'
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});
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$('body').append(form);
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$('#rpt_p').submit();
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$('#rpt_p').remove();
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});
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});
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//]]>
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</script>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<h1>window.open で開いたウィンドウに pdf をダウンロード</h1>
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<input type="button" id="btn_ok" value="GET" />
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<input type="button" id="btn_dame" value="POST" />
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</div>
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</form>
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</body>
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</html>
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```
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**out.aspx.vb** に該当するもの。言語は C# です。（ページの名前は 0008-out.aspx としています）
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```
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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public partial class _0008_out : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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Response.Cache.SetCacheability(HttpCacheability.NoCache);
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Response.Cache.SetNoStore();
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Response.ClearHeaders();
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Response.ClearContent();
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Response.ContentType = "Application/pdf";
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Response.AddHeader("content-disposition", "inline; filename=sample.pdf");
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string path = Server.MapPath("~/app_data/sample.pdf");
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Response.TransmitFile(path);
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Response.End();
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}
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}
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```
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上記 base.aspx の［POST］ボタンをクリックしたとき、**Fiddler で見た要求と応答**
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**要求** （コンテンツは設定してないので空です）
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```
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POST http://websiteproject.com/0008-out.aspx HTTP/1.1
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Accept: text/html, application/xhtml+xml, image/jxr, */*
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Referer: http://websiteproject.com/0008-AutoPostByScript.aspx
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Accept-Language: ja
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User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
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Content-Type: application/x-www-form-urlencoded
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Accept-Encoding: gzip, deflate
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Content-Length: 0
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Host: websiteproject.com
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Connection: Keep-Alive
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Pragma: no-cache
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```
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**応答**
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```
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HTTP/1.1 200 OK
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Cache-Control: private
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Content-Type: Application/pdf
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Server: Microsoft-IIS/10.0
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content-disposition: inline; filename=sample.pdf
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X-AspNet-Version: 4.0.30319
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X-Powered-By: ASP.NET
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Date: Thu, 29 Jun 2017 07:12:49 GMT
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Content-Length: 73552
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%PDF-1.4
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%äüöß
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2 0 obj
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<</Length 3 0 R/Filter/FlateDecode>>
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stream
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・・・以下省略・・・
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```
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