Sendgrid-python: text/plain must precede text/html content

Created on 27 Oct 2017 · 3Comments · Source: sendgrid/sendgrid-python

Issue Summary

Requests to send mail with both plain text and HTML content fail if the HTML content is specified first.

Code

sg = sendgrid.SendGridAPIClient(apikey=sendgrid_key)
mail = Mail()
from_email = Email("[email protected]")
to_email = Email("[email protected]")
subject = "Sending with SendGrid is Fun"
per = Personalization()
mail.from_email = from_email
mail.subject = subject
html_content = Content("text/html", "<html><body>some text here</body></html>")
plain_content = Content("text/plain", "and easy to do anywhere, even with Python")

### Add plain content first
mail.add_content(plain_content)

### Add HTML content next
mail.add_content(html_content)

per.add_to(to_email)
mail.add_personalization(per)
response = sg.client.mail.send.post(request_body=mail.get())

Steps to Reproduce

The above code works properly, but if you reverse the order of the add_content lines, http-client throws a BadRequestsError

Expected Result

The library should sort content into the order that the API expects. (I'm not clear why the order should matter to the API—perhaps this should be fixed there instead.)