_section: Web Utilities  @<web>


_property: ethers.utils.fetchJson(urlOrConnectionInfo [, json [ , processFunc ] ]) => Promise<any> @<utils-fetchJson>
Fetch and parse the JSON content from //urlOrConnectionInfo//, with the
optional body //json// and optionally processing the result with //processFun//
before returning it.

_property: ethers.utils.poll(pollFunc [, options ]) => Promise<any> @<utils-poll>
Repeatedly call pollFunc using the [[PollOptions]] until it returns a
value other than undefined.


_heading: ConnectionInfo @<ConnectionInfo>

_property: connection.url => string
The URL to connect to.

_property: connection.user => string
The username to use for [[link-wiki-basicauth]].
The default is null (i.e. do not use basic authentication)

_property: connection.password => string
The password to use for [[link-wiki-basicauth]].
The default is null (i.e. do not use basic authentication)

_property: connection.allowInsecureAuthentication => boolean
Allow [[link-wiki-basicauth]] over non-secure HTTP. The default is false.

_property: connection.timeout => number
How long to wait before rejecting with a //timeout// error.

_property: connection.headers => { [ key: string]: string }
Additional headers to include in the connection.


_heading: PollOptions @<PollOptions>

_property: options.timeout => number
The amount of time allowed to elapse before triggering a timeout
error.

_property: options.floor => number
The minimum time limit to allow for [[link-wiki-backoff]].

The default is 0s.

_property: options.ceiling => number
The maximum time limit to allow for [[link-wiki-backoff]].

The default is 10s.

_property: options.interval => number
The interval used during [[link-wiki-backoff]] calculation.

The default is 250ms.

_property: options.retryLimit => number
The number of times to retry in the event of an error or //undefined// is
returned.

_property: options.onceBlock => [[Provider]]
If this is specified, the polling will wait on new blocks from
//provider// before attempting the //pollFunc// again.

_property: options.oncePoll => [[Provider]]
If this is specified, the polling will occur on each poll
cycle of //provider// before attempting the //pollFunc//
again.