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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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  • Long life span 50,000 hours.
  • Continuous length, packed with 5 meter.
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Item Weight 0.035 ounces
Manufacturer zmtd

Product Description

Superb right 3528 5050 SMD LED, high intensity and reliability.
Long life span 50,000 hours.
Continuous length, packed with 5 meter.
Flexible ribbon for curving around bends.
Completely smooth and even light spread, solving the uneven luminous problem.
but running at low temperature
Low power consumption
Specifications:
1.Size: L500cm (5M) x W1cm x T0.35cm
2.Emit Color: RGB
3.Protection Rate : IP65 Waterproof
IP20 No Waterproof
4.Working Voltage: 12V DC
5.LED Quantity: 3528 is 60leds / m, 5050 is is 30leds /m, 5meter / roll
6.View angle: 120 ° ~ 140 °
7.Working Temperature: -20 ° to 50 °
8.Color Temperature:
warm white:3000-3500K
white:5500-6000K

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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,
maxNumberAttemptsAmerican Shifter 355275 Shifter Kit (904 10" E Brake Cable Trim Kit Dipstick For CB0E2) 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 UDEAR Bamboo Clothing Rack with Shelves,Freestanding Garment Rack,Hanging Clothes Rack for Bedroom,Large(Black) 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 Update International (SFC-11) 11" Induction Ready Excalibur-Coated Stainless Steel Fry Pan.

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 initialDelayMsDiamond Painting Kits,Flower 5D DIY Full Drill Diamond Art for Adults Crystal Rhinestone Embroidery Cross Stitch Craft for Home Wall Decor Gift Square Drill,80x100cm(32x40in)

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: True Religion Men's Danny Tapered Leg Jean
dedupExchange,
cacheExchange,
retryExchange({
retryIf: error => {
return !!(error.graphQLErrors.length > 0 || errorSPNEC Stainless Steel Lid Stand,Kitchen Shelf Pot Lid Rack Organizer Stand for Lids Pan Cutting Board Holder StoragenetworkError);
}),
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) Lovejoy 05447 Size 1120 Grid Coupling Cover Hardware Only, Vertical, Steel, Inch Hardware {
if (error.networkError) {
const context = { 5 Packs Burlap Hessian White Lace Table Runner for Rustic Vintage Country Wedding Party Bridal Shower Baby Shower Kitchen Dining Table Decoration Farmhouse Woodland Decor, 12x72 inchesoperation.context, url: fallbackUrl };
return { ...operationColumbia Men's Silver Ridge Lite Long Sleeve Shirt, Fossil, 4X context };
}

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return null;
},
};
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