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Level 8

HTTP action broken by Content-Type `text/html; charset="utf-8"`

The HTTP action fails to parse the Content-Type header of a response if it contains a quoted charset subtype.


content-type: text/html; charset="utf-8"


According to RFC7231 Section, it is valid to have quotes around a subtype, such as charset.


I created a simple example Flow to illustrate the point.


2018-11-08 12_06_48-Edit your flow _ Microsoft Flow.png


Here's the response in the triggering Flow's HTTP action:


  "error": {
    "code": "BadRequest",
    "message": "The provided input content is not valid: 'The provided content-type character set '\"utf-8\"' is not valid. Please use a Unicode character set such as UTF-8 or ASCII character set.'."

Another example showing a request to GET a Facebook post webpage (not through their Graph API):


2018-11-08 12_12_36-Run History _ Microsoft Flow.png


Will the Flow team implement support for quoted content subtypes?

Community Support Team
Community Support Team

Re: HTTP action broken by Content-Type `text/html; charset="utf-8"`

Hi @degvalentine,


From the error message, it seems that the provided content type character set utf-8 has not been supported yet.

If you need a support for quoted content subtypes, please submit your idea on Flow Ideas Forum at here:


Best regards,


Community Support Team _ Mabel Mao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Level 8

Re: HTTP action broken by Content-Type `text/html; charset="utf-8"`



Names for character encodings are case-insensitive, so "utf-8" and "UTF-8" are identical. This isn't about charset support, just about header parsing.


You can see it in the error message where is effectively says "utf-8 isn't valid, please choose UTF-8".

...character set '\"utf-8\"' is not valid. Please use a Unicode character set such as UTF-8...


Do you mean you believe the header parsing intentionally didn't support the full spec and should be treated as a new feature instead of a bug?

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