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Update writing.md (#668)

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Trying to make this a bit clearer
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Nigel Deakin
2018-01-10 17:21:55 +00:00
committed by Reed Allman
parent b62b39d93f
commit d1e02f42ed
1 changed files with 8 additions and 3 deletions
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docs/writing.md
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@@ -24,10 +24,13 @@ db.update(return_struct)
## Inputs
Inputs are provided through standard input and environment variables. We'll just talk about the default input format here, but you can find others [here](function-format.md).
To read in the function body, just read from STDIN.
Inputs are provided through standard input and environment variables.
You will also have access to a set of environment variables, independent of
The way that input data is supplied to functions depends on the input format (as specified in `func.yml`) that your function is using.
If you're using `default` format then you can simply read the function input from STDIN. For more information and to find out about other input formats see [Open Function Format](function-format.md).
Your function also has access to a set of environment variables, independent of
the function's format:
* `FN_APP_NAME` - the name of the application that matched this route, eg: `myapp`
@@ -57,6 +60,8 @@ For `http` format these will be in http headers:
* `Fn_method` - the HTTP method used to invoke
* `$X` - the HTTP headers that were set for this request, exactly as they were sent in the request.
If you're implementing your function using a fdk this will provide an API to obtain the http headers.
For `json` format, these will be fields in the json object (see
[format](functions-format.md)):