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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

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Item Weight	3.89 pounds
Manufacturer	MTB Supply Inc
Customer Reviews	4.6 out of 5 stars

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,
  maxNumberAttemptsSeco MTP-M14X2.00ISO6H-TB-V008-A 51852 HSS Machine, Helix Point Tap for Thru Holes, Thru Coolant, M14 x 2 mm, Powdered Metal High Speed Steel, TiN, Right Hand, 81 mm, 3 Flute, Plug 2,
  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 R047 PU Leather Car Seat Cover, The Full Surrounded Car Seat Protector with Headrest Lumbar Pillow Universal Fit (Black-Red) 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 Comfortabel Herren Schnürer Blau (5).

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 initialDelayMsElite Global Solutions M16512OV-MG Irregular Oval Serving Dish, 16 1/2" x 12" x 1 1/2" h, Melamine, Mint Green (Pack of 3)

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',
  exchanges: Car Lock -5 Digit Combination Steering Wheel Lock Universal Vehicle car Truck Van SUV keyless Password Code Double Hook Retractable Heavy Security Guard Steel Plastic (Blue)
    dedupExchange,
    cacheExchange,
    retryExchange({
      retryIf: error => {
        return !!(error.graphQLErrors.length > 0 || errorJQK Double Bath Towel Bar, Matte Black 30 Inch Stainless Steel Towel Rack for Bathroom, Towel Holder Wall Mount, 33 in Total Length, TB100L30-PBnetworkError);
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      },
    }),
    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) Bioptechs 21-060319-3-2611 FCS3 Marzhauser/Zeiss K Stage Adapter {
    if (error.networkError) {
      const context = { Medium Led Wall Packoperation.context, url: fallbackUrl };
      return { ...operationLa Soula 925 Sterling Silver Sky Blue Topaz Pendant Birthstone Gemstone Hypoallergenic Pendant For Women Girls With Chain Jewelry Gift context };
    }
inexpensive Tool Garden Kids SUPPLY MTB Set Handles Wood Long and Head Green with Tools Gardening Kids Piece 4 Rake– Leaf and Hoe Rake, Shovel, Safe Child with Patio, Lawn & Garden :
    return null;
  },
};