英文:
Why the gmail API sends html emails as plain text?
问题
我正在尝试使用Gmail API发送HTML邮件，但由于某些原因，它随机将邮件发送为纯文本。似乎Google修改了我设置的内容类型头。有什么原因吗？邮件内容始终完全相同（我进行了测试）。API仍然是实验性的吗？
有时，当它工作时，它还会添加Content-Type: multipart/alternative;（尽管我从未设置过）。
编码过程如下所示。代码是Go语言的，但我认为它很容易理解，过程与语言无关。
header := make(map[string]string)
header["From"] = em.From.String()
header["To"] = em.To.String()
// header["Subject"] = encodeRFC2047(em.Subject)
header["Subject"] = em.Subject
header["MIME-Version"] = "1.0"
header["Content-Type"] = "text/html; charset=\"utf-8\""
// header["Content-Transfer-Encoding"] = "base64"
header["Content-Transfer-Encoding"] = "quoted-printable"
var msg string
for k, v := range header {
msg += fmt.Sprintf("%s: %s\r\n", k, v)
}
msg += "\r\n" + em.Message
gmsg := gmail.Message{
Raw: encodeWeb64String([]byte(msg)),
}
_, err = gmailService.Users.Messages.Send("me", &gmsg).Do()
英文:
I'm trying to send a html email using the gmail API but for some reasons it randomly sends the email as plain/text. It seems that Google alters the content type header I set. Is there any reason for that? The email content is exactly same all the time (as I test it). Is the API still experimental?
Sometimes when it works it also adds Content-Type: multipart/alternative; (although I never set it).
The encoding process looks as below. The code is Go but I guess it self explanatory and the process is language agnostic.
header := make(map[string]string)
header["From"] = em.From.String()
header["To"] = em.To.String()
// header["Subject"] = encodeRFC2047(em.Subject)
header["Subject"] = em.Subject
header["MIME-Version"] = "1.0"
header["Content-Type"] = "text/html; charset=\"utf-8\""
// header["Content-Transfer-Encoding"] = "base64"
header["Content-Transfer-Encoding"] = "quoted-printable"
var msg string
for k, v := range header {
msg += fmt.Sprintf("%s: %s\r\n", k, v)
}
msg += "\r\n" + em.Message
gmsg := gmail.Message{
Raw: encodeWeb64String([]byte(msg)),
}
_, err = gmailService.Users.Messages.Send("me", &gmsg).Do()
答案1
得分: 2
嗯，你确定这不是你程序中的一个错误吗？你能打印出整个字符串并粘贴在这里吗？
我刚刚使用Gmail API发送了一封邮件，内容如下：
收件人：<已删除> 主题：测试HTML邮件 2015-01-14 09:45:40 内容类型：text/html <html><body><b>你好</b>世界</body></html>
在收件人的Gmail中，它看起来和预期一样。实际上，它似乎被包装在一个multipart/alternative中，并添加了一个text/plain部分（我认为这是个好事）：
<随机跟踪头部> MIME-Version: 1.0 发件人：<已删除> 日期：Wed, 14 Jan 2015 09:46:41 -0800 消息ID：<已删除> 主题：测试HTML邮件 2015-01-14 09:45:40 收件人：<已删除> 内容类型：multipart/alternative; boundary=089e0141a9a2875c38050ca05201 --089e0141a9a2875c38050ca05201 内容类型：text/plain; charset=UTF-8 *你好*世界 --089e0141a9a2875c38050ca05201 内容类型：text/html; charset=UTF-8 <html><body><b>你好</b>世界</body></html> --089e0141a9a2875c38050ca05201--
无论如何，它正在进行一些解析/清理操作，但确实允许发送text/html格式的邮件。
英文:
Hmm, are you sure it's not a bug in your program? Can you print out the entire string and paste it here?
I just used the Gmail API to send an email like:
<pre>
To: <redacted>
Subject: test html email 2015-01-14 09:45:40
Content-type: text/html
<html><body><b>hello</b>world</body></html>
</pre>
and it looked as expected by the recipient's end in Gmail. Well, actually looks like it got wrapped it in a multipart/alternative and added a text/plain part as well (good thing IMO):
<pre>
<random trace headers>
MIME-Version: 1.0
From: <redacted>
Date: Wed, 14 Jan 2015 09:46:41 -0800
Message-ID: <redacted>
Subject: test html email 2015-01-14 09:45:40
To: <redacted>
Content-Type: multipart/alternative; boundary=089e0141a9a2875c38050ca05201
--089e0141a9a2875c38050ca05201
Content-Type: text/plain; charset=UTF-8
helloworld
--089e0141a9a2875c38050ca05201
Content-Type: text/html; charset=UTF-8
<html><body><b>hello</b>world</body></html>
--089e0141a9a2875c38050ca05201--
</pre>
In any case, it's doing some parsing/sanitizing but does allow sending text/html email.
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