I cannot get it running

Expected Behavior As far as i understood the docs here, i should just:

• install the npm module
• add it to my existing array of apollo-links, preverably after my existing "onError" catch
• having fun with retries

Actual Behavior

• It's not retrying anything
• Without onError, still not working
• I thought maybe it's because we were not "forwarding" anything in onError, added "return forward(operation)", still not working
• If the RetryLink is the last link in the array, following Exception occurs this.nextLink is not a function
• I added logs everywhere in the "apollo-link-retry" package locally installed in my node_modules.. what i see there is that -- every single query starts a "retry", no matter if it has an error or not, but most of them get "cancelled" again -- also the queries with an error inside and which are getting a Retriable Class instance too, are getting cancelled too, no idea why -- my "retryIf" method is never getting called

A simple reproduction Add the "retry" link to an existing project working with apollo-client and following links:

• ApolloLink from 'apollo-link'
• onError from 'apollo-link-error'
• BatchHttpLink from 'apollo-link-batch-http'
• Break one of your Queries on GraphQL server, so it should retry that one
• Check your network tab, you only see the broken query request with the error and no further ones, so no retry is happening

i cannot share our project as it is a huge commercial e-commerce platform..

Issue Labels

• has-reproduction
• feature
• docs
• blocking
• good first issue

I'm missing examples in the doc for following questions:

• Is the order important inside an existing "apollo-link" array? Guess yes with my experience so far, nothing written about that
• What are reasons why "retryIf" is not getting called? Seems i'm missing a few important points here
• Why does it need to be the last link in my array?
• Are further retry-queries/POST requests somehow flagged that it is a retry-request? I cannot check this as i never managed to get an actual retry-request working..