ContextKey is a type safe and collision free way to use context values. It is defined using createContextKey function which takes a default value and returns a ContextKey object. The default value is used when the context value is not set.

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An interceptor can add logic to clients, similar to the decorators or middleware you may have seen in other libraries. Interceptors may mutate the request and response, catch errors and retry/recover, emit logs, or do nearly anything else.

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Let's say you want to log the response body. But you don't want to do it for every request. You only want to do it from a specific component. You can use context values to achieve this.

For example, by default, Connect sets the Fetch option redirect to error, which means that a network error will be returned when a request is met with a redirect. However, if you wish to change this value to follow for example, you can do so using an interceptor.

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Context values are a type safe way to pass arbitary values from the call site or from one interceptor to the next. You can use createContextValues function to create a new ContextValues. The contextValues call option can be used to provide a ContextValues instance for each request.

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It is best to define context keys in a separate file and export them. This is better for code splitting and also avoids circular imports. This also helps in the case where the provider changes based on the environment.

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You can think of interceptors like a layered onion. A request initiated by a client goes through the outermost layer first. Each call to next() traverses to the next layer. In the center, the actual HTTP request is run by the transport. The response then comes back through all layers and is returned to the client. In the array of interceptors passed to the transport, the interceptor at the end of the array is applied first.

The stream property of the response tells us whether this is a streaming response. A streaming response has not fully arrived yet when we intercept it — we have to wrap it to see individual messages:

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Another valuable use case for interceptors is customizing the Fetch API for individual requests by leveraging the request.init object.

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