README.md

🔥 Cache every request in Angular, not only the GET, but all methods of this interceptor, and allows you to interact with the interceptor via specific headers and modify the request, and these specific headers will be not included in the final request v2024.10.103

Bugs are evident™ - MATRIX️

NodeJS LTS is supported

Built on NodeJs version

v22.3.0

Built on Angular

18.0.5

Description

Usually, when you want to cache all requests, you do not cache all requests, but only the GET method. But, for some frontend applications, it is required to cache everything, otherwise the subsequent requests, without cache, would slow down the application flow. So, this micro-service caches all method/path/query variables/parameters/request body.

The way, we can find out what we are caching it is not simple. Usually, you would cache by a key of the httpRequest.urlWithParams and only the GET HTTP method.

To create this cache key, this package is using the object-hash package, with the following algorithm:

import * as hash from 'object-hash'

const hashOptions = {
  algorithm: 'md5',
  encoding: 'hex'
}

httpToKey(httpRequest: HttpRequest<any>) {
    const key = httpRequest.method + '@' + httpRequest.urlWithParams + '@' + hash(httpRequest.params, hashOptions) + '@' + hash(httpRequest.body, hashOptions)
    return key
}

There is room in the future, to restrict to specific methods and add more configurations and functions. If there is a need for this micro-service, it could be enhanced, but for now, it is caching everything, with the exception, when you include the CachingHeaders.NoCache header into your request, then this request will always hit the server.

Example web page that uses this package

https://angular-http-cache-interceptor.corifeus.com

How to use it

npm i p3x-angular-http-cache-interceptor object-hash

Include the caching interceptor into your Angular module

import { NgModule } from '@angular/core';

import { P3XHttpCacheInterceptorModule  } from 'p3x-angular-http-cache-interceptor';

@NgModule({
  declarations: [
  ],
  imports: [
    P3XHttpCacheInterceptorModule,
  ],
  providers: [
  ],
  bootstrap: []
})
export class SomeModule { }

Options

import { P3XHttpCacheInterceptorModule, CachingHeaders, CachingStore  } from 'p3x-angular-http-cache-interceptor';

P3XHttpCacheInterceptorModule.forRoot({
    // default request is no cache
    behavior: CachingHeaders.NoCache,
    
    // if a request has CachingHeaders.Cache header it will cache globally
    store: CachingStore.Global,
})

P3XHttpCacheInterceptorModule.forRoot({
    // default request is cache
    behavior: CachingHeaders.Cache,

    // in this config, it will cache not globally, but per module
    store: CachingStore.PerModule,
})

Example invocation in a component

With and without cache:

import { Component } from '@angular/core';

import { HttpClient } from "@angular/common/http";
import {MatSnackBar} from "@angular/material/snack-bar";

import { CachingHeaders } from 'p3x-angular-http-cache-interceptor'

@Component({
  selector: 'p3x-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {

  constructor(
    private http: HttpClient,
    private snack: MatSnackBar,
  ) {
  }

  async loadCached() {
    try {
      const response : any = await this.http.get('https://server.patrikx3.com/api/core/util/random/32').toPromise()
      this.snack.open(`Will be always the same: ${response.random}`, 'OK')
    } catch(e) {
      this.snack.open(`Sorry, error happened, check the console for the error`, 'OK')
      console.error(e)
    }
  }

  async loadNonCached() {
    try {
      const response : any = await this.http.get('https://server.patrikx3.com/api/core/util/random/32', {
        headers: {
          [CachingHeaders.NoCache]: '1'
        }
      }).toPromise()
      this.snack.open(`Truly random data: ${response.random}`, 'OK')
    } catch(e) {
      this.snack.open(`Sorry, error happened, check the console for the error`, 'OK')
      console.error(e)
    }
  }

}

---

Support Our Open-Source Project ❤️

If you appreciate our work, consider starring this repository or making a donation to support server maintenance and ongoing development. Your support means the world to us—thank you!

Server Availability

Our server may occasionally be down, but please be patient. Typically, it will be back online within 15-30 minutes. We appreciate your understanding.

About My Domains

All my domains, including patrikx3.com and corifeus.com, are developed in my spare time. While you may encounter minor errors, the sites are generally stable and fully functional.

Versioning Policy

Version Structure: We follow a Major.Minor.Patch versioning scheme:

• Major: Corresponds to the current year.
• Minor: Set as 4 for releases from January to June, and 10 for July to December.
• Patch: Incremental, updated with each build.

Important Changes: Any breaking changes are prominently noted in the readme to keep you informed.

---

P3X-ANGULAR-HTTP-CACHE-INTERCEPTOR Build v2024.10.103