Get Content Type of Request

Question

To find the incoming content type, docs say:

 request.headers["Content-Type"] # => "text/plain"

But I found by trial-and-error, that doesn't work, but this does:

 request.headers["CONTENT_TYPE"]=='application/json'

So what's the most robust+portable way to do it?

Solution 1

I would usually go for request.format and request.content_type for reading these header fields.

EDIT: found a bit more on this that might help: https://stackoverflow.com/a/1595453/624590

Solution 2

You don't need to parse the content_type string, Rails has already done this for you. Just check:

request.format.symbol == :json

Solution 3

Another way of writing it:

request.format.json?

Solution 4

No need to call #symbol since equals is overloaded:

request.format == :json

Solution 5

For me the best way to check if incoming request is a json was:

    if request.content_type =~ /json/

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Comments

[Intrepidd]

What version of rails are you working with ?

[DRobinson]

Judging by the tags he attached, probably 3.1

[Admin]

#binding.pry respond_to do |format| if (request.content_type == "application/json") format.json {render json: @user} elsif (request.content_type == "application/xml") format.xml {render xml: @user} else format.html end end

[Nathan B]

But if the request accept header is /, it will still be false, right?