feat: As a user, I want to let api-breaker plugin return default response body

[qihaiyan]

Description

refer to the document api-breaker
when upstream is in the unhealthy state, the api-breaker returns unhealthy.http_statuses only, without a response body.
In order to be more compatible to the client, return a default response body is useful.

[tokers]

Sound good, which value do you think is reasonable for the default response body?

[qihaiyan]

Sound good, which value do you think is reasonable for the default response body?

Different api may return different default value. Users should specify the default value with admin api, and the plugin api could add a new param like unhealthy.http_response_body

[tokers]

Sound good, which value do you think is reasonable for the default response body?

Different api may return different default value. Users should specify the default value with admin api, and the plugin api could add a new param like unhealthy.http_response_body

I think a field like break_response_body can be added.

[qihaiyan]

Sound good, which value do you think is reasonable for the default response body?

Different api may return different default value. Users should specify the default value with admin api, and the plugin api could add a new param like unhealthy.http_response_body

I think a field like break_response_body can be added.

I could make a pr for this, if you don't mind. @tokers

[tokers]

Sound good, which value do you think is reasonable for the default response body?

Different api may return different default value. Users should specify the default value with admin api, and the plugin api could add a new param like unhealthy.http_response_body

I think a field like break_response_body can be added.

I could make a pr for this, if you don't mind. @tokers

Sure, assigned to you.