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The retryExchange lets us retry specific operation, by default it will retry only network errors, but we can specify additional options to add functionality.

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First install @urql/exchange-retry alongside urql:

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yarn add @urql/exchange-retry
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npm install --save @urql/exchange-retry

You'll then need to add the retryExchange, exposed by this package, to your urql Client:

import { createClient, dedupExchange, cacheExchange, fetchExchange } from 'urql';
import { retryExchange } from '@urql/exchange-retry';
// None of these options have to be added, these are the default values.
const options = {
initialDelayMs: 1000,
maxDelayMs: 15000,
randomDelay: true,
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retryIf: err => err && err.networkError,
};
// Note the position of the retryExchange - it should be placed prior to the
// fetchExchange and after the cacheExchange for it to function correctly
const client = createClient({
url: 'http://localhost:1234/graphql',
exchanges: [
dedupExchange,
cacheExchange,
retryExchange(options), // Use the retryExchange factory to add a new exchange
fetchExchange,
],
});

We want to place the retryExchange before the fetchExchange so that retries are only performed after the operation has passed through the cache and has attempted to fetch.

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There are a set of optional options that allow for fine-grained control over the Disney Boys Frozen Olaf Stainless Steel Analog-Quartz Watch with Leather-Synthetic Strap, Blue, 16 (Model: WDS000194) mechanism.

We have the initialDelayMs to specify at what interval the retrying should start, this means that if we specify 1000 that when our operation fails we'll wait 1 second and then retry it.

Next up is the maxDelayMs, our retryExchange will keep increasing the time between retries, so we don't spam our server with requests it can't complete, this option ensures we don't exceed a certain threshold. This time between requests will increase with a random back-off factor multiplied by the initialDelayMs, read more about the Allied Brass PR-24-5 Prestige Regal Collection 5 Reserve Roll Toilet Paper Holder, Antique Pewter.

Talking about increasing the delay randomly, randomDelay allows us to disable this. When this option is set to false we'll only increase the time between attempts with the initialDelayMsCovercraft Carhartt Mossy Oak Camo SeatSaver Front Row Custom Fit Seat Cover for Select Toyota Tacoma Models - Duck Weave (Break-Up Country) - SSC2403CAMB

We don't want to infinitely attempt an operation, we can declare how many times it should attempt the operation with maxNumberAttempts.

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We can introduce specific triggers for the retryExchange to start retrying operations, let's look at an example:

import { createClient, dedupExchange, cacheExchange, fetchExchange } from 'urql';
import { retryExchange } from '@urql/exchange-retry';
const client = createClient({
url: 'http://localhost:1234/graphql',
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dedupExchange,
cacheExchange,
retryExchange({
retryIf: error => {
return !!(error.graphQLErrors.length > 0 || errorFIA SP8816BL Seat CovernetworkError);
}),
fetchExchange,
],
});

In the above example we'll retry when we have graphQLErrors or a networkError, we can go more granular and check for certain errors in graphQLErrors.

In case of a network error, e.g., when part the infrastructure is down, but a fallback GraphQL endpoint is available, e.g., from a different provider on a different domain, the retryWith option allows for client-side failover. This could also be used in case of a graphQLError, for example, when APIs are deployed via a windowing strategy, i.e., a newer version at URL X, while an older one remains at Y.

Note that finer granularity depending on custom requirements may be applicable, and that this does not allow for balancing load.

const fallbackUrl = 'http://localhost:1337/anotherGraphql';

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const options = {
initialDelayMs: 1000,
maxDelayMs: 15000,
randomDelay: true,
maxNumberAttempts: 2,
retryWith: (error, operation) Greenlee 721-1/2P KNOCKOUT PUNCH, 7/8 IN (22.500 MM) Actual Hole Size {
if (error.networkError) {
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}

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return null;
},
};
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