Request parser with fallback

[akaNightmare]

Summary

Hello, I'm wondering if there any way to parse request with a fallback, example:

pub MyStruct {
  pub field1: bool,
  pub field2: u32,
  pub field3: String,
}

so for field1 need to extract value from query params field1=true or from headers['x-field1'] and so on.

Thanks in advance.

axum version

0.7.5

[mladedav]

I don't think there's currently a way to parse something from a query parameter or from header. You could write your own type implementing FromRequestParts which would probably just wrap the two inner extractors. Then you could have three extractors, one for each of the fields.

Or you can write one extractor specifically for this usecase that tries query and then headers for each of your fields.