被 CORS 策略阻止：请求的资源上不存在 'Access-Control-Allow-Origin' header。使用 Solr 8.1.0 的 Angular 8 应用程序出错

Question

当我检查 Chrome 浏览器的控制台时，我的 Angular 8 应用程序出现 CORS 错误。

这是在我搜索 Solr 搜索版本 8.1.0 时发生的。

这是我的solr URL http://abc123.aaa.bbb.com:8983/solr/VW_POB_SOLR_SEARCH_MASTER/select?q=search_text:%22maha%22

Access to XMLHttpRequest at 'http://abc123.aaa.bbb.com:8983/solr/VW_POB_SOLR_SEARCH_MASTER/select?q=search_text:%22maha%22' from origin 'http://localhost:4201' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Failed to load resource: net::ERR_FAILED

core.js:6014 ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: "http://abc123.aaa.bbb.com.com:8983/solr/VW_POB_SOLR_SEARCH_MASTER/select?q=search_text:"maha"", ok: false, …}

我尝试了 Whosebug 中提到的几种方法，但似乎没有用。

CORS Angular 8 it gives me

Having issue with CORS error in angular 8 App

https://www.techiediaries.com/fix-cors-with-angular-cli-proxy-configuration/

我认为 Cross Origin 存在一些问题我什至尝试通过“npm install --save cors”安装 CORS。

我的 Proxy.conf.js 看起来像这样：

    "/api/*": {
      "target": "http://localhost:8080",
      "secure": false,
      "logLevel": "debug",
      "changeOrigin": true
    }
  }

我的 angular.json 看起来像这样

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "JBPWebNg": {
      "projectType": "application",
      "schematics": {},
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/JBPWebNg",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": false,
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/custom-theme.scss",
              "src/styles.css"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "6kb",
                  "maximumError": "10kb"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "JBPWebNg:build",
            "proxyConfig": "src/proxy.conf.json"
          },
          "configurations": {
            "production": {
              "browserTarget": "JBPWebNg:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "JBPWebNg:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.css"
            ],
            "scripts": []
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "tsconfig.app.json",
              "tsconfig.spec.json",
              "e2e/tsconfig.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        },
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "JBPWebNg:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "JBPWebNg:serve:production"
            }
          }
        }
      }
    }
  },
  "defaultProject": "JWebNg"
}

如果有人知道解决方法，请告诉我。

Answer 1

你不知道。您发出请求的服务器必须实施 CORS 以授予 JavaScript 从您的网站访问权限。您的 JavaScript 无法授予自己访问其他网站的权限。

使用 chrome 浏览器的网上商店的 CORS 扩展。

这是 link 的扩展：https://chrome.google.com/webstore/detail/allow-cors-access-control/lhobafahddgcelffkeicbaginigeejlf/related?hl=en

被 CORS 策略阻止：请求的资源上不存在 'Access-Control-Allow-Origin' header。使用 Solr 8.1.0 的 Angular 8 应用程序出错

blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Error in Angular 8 application with Solr 8.1.0

solr

cors

angular