Getting '400 Bad Request' when trying to open an attachment in the inbox

Smart CRM & Sales Hub CRM
1

受信トレイに保存されているフォームからの問い合わせメールの添付ファイルを
添付を開こうとすると「400 Bad Request」になり開けません。
HubSpotからの通知メールに書かれているURLは問題なく開くことができます。
受信トレイにあるメールの添付のリンクと

通知メールのリンクを比べると「〜.pdf」までは同じで、それ以降の

パラメータに違いがあります。

問題を解消するにはどうしたらいいでしょうか。

2

Hello!

Thank you for sharing the detailed information. It’s very helpful! I’ll mention a few key community members who may have experience with this issue and could suggest appropriate solutions. :blush:

@Makoto @marykashima Have you ever encountered a “400 Bad Request” error when trying to open an attachment from your inbox? If you have any insights, please share!

Have a wonderful day.
Cassie, Community Manager

3

返信ありがとうございます。

原因ははっきりさせたいですが、コミュニティに投稿したのち数時間経って再度確認したら、

添付ファイルが開けるようになっていました。

4

Hi @CSRadmin, nice to meet you. I’m Shinohara from GuildSpot.

I suspect the issue was due to instability in the AWS (server) infrastructure used by HubSpot. It’s still unstable at the moment.
The fact that the same attachment became visible after some time is evidence of this.

For reference, here are the common causes of a 400 error, though they don’t seem to apply in this case:

An HTTP Status 400 Bad Request error indicates that the request sent from the client (browser) is flawed and cannot be processed by the server. The main causes include corrupted or bloated cookies/cache, incorrect URLs, or invalid file uploads. Effective troubleshooting steps include clearing browser cookies and cache, verifying the URL, and trying again in a private browsing window.

Main Causes and Solutions
• Corrupted Cookies/Cache (most common cause): Often resolved by clearing the browser’s cookies and cache.
• URL Typos: Occurs when there’s an error in the URL or special characters aren’t properly encoded.
• File Size Exceeded: Happens when the uploaded file is too large.
• Invalid Request Format: Occurs when the submitted data doesn’t match the format expected by the server.

First Steps to Try (Client-Side)
• Clear Browser Cache and Cookies: Clear cache and cookies via your browser settings.
• Use Incognito/Private Mode: Reopen the page in an incognito or private browsing window.
• Verify the URL: Check for unnecessary characters or typos in the URL.
• Restart the Browser: Close and reopen the browser. If none of these steps resolve the issue, it may be a server-side problem (such as incorrect URL routing).