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This allows for non-http-spec-compliant servers that might\n * expect capitalized header names.\n */\n preserveHeaderCase?: boolean;\n\n /**\n * The credentials policy you want to use for the fetch call.\n */\n credentials?: string;\n\n /**\n * Any overrides of the fetch options argument to pass to the fetch call.\n */\n fetchOptions?: any;\n\n /**\n * If set to true, use the HTTP GET method for query operations. Mutations\n * will still use the method specified in fetchOptions.method (which defaults\n * to POST).\n */\n useGETForQueries?: boolean;\n\n /**\n * If set to true, the default behavior of stripping unused variables\n * from the request will be disabled.\n *\n * Unused variables are likely to trigger server-side validation errors,\n * per https://spec.graphql.org/draft/#sec-All-Variables-Used, but this\n * includeUnusedVariables option can be useful if your server deviates\n * from the GraphQL specification by not strictly enforcing that rule.\n */\n includeUnusedVariables?: boolean;\n /**\n * A function to substitute for the default query print function. Can be\n * used to apply changes to the results of the print function.\n */\n print?: Printer;\n}\n\nexport interface HttpQueryOptions {\n includeQuery?: boolean;\n includeExtensions?: boolean;\n preserveHeaderCase?: boolean;\n}\n\nexport interface HttpConfig {\n http?: HttpQueryOptions;\n options?: any;\n headers?: Record<string, string>;\n credentials?: any;\n}\n\nconst defaultHttpOptions: HttpQueryOptions = {\n includeQuery: true,\n includeExtensions: false,\n preserveHeaderCase: false,\n};\n\nconst defaultHeaders = {\n // headers are case insensitive (https://stackoverflow.com/a/5259004)\n accept: '*/*',\n // The content-type header describes the type of the body of the request, and\n // so it typically only is sent with requests that actually have bodies. One\n // could imagine that Apollo Client would remove this header when constructing\n // a GET request (which has no body), but we historically have not done that.\n // This means that browsers will preflight all Apollo Client requests (even\n // GET requests). Apollo Server's CSRF prevention feature (introduced in\n // AS3.7) takes advantage of this fact and does not block requests with this\n // header. If you want to drop this header from GET requests, then you should\n // probably replace it with a `apollo-require-preflight` header, or servers\n // with CSRF prevention enabled might block your GET request. See\n // https://www.apollographql.com/docs/apollo-server/security/cors/#preventing-cross-site-request-forgery-csrf\n // for more details.\n 'content-type': 'application/json',\n};\n\nconst defaultOptions = {\n method: 'POST',\n};\n\nexport const fallbackHttpConfig = {\n http: defaultHttpOptions,\n headers: defaultHeaders,\n options: defaultOptions,\n};\n\nexport const defaultPrinter: Printer = (ast, printer) => printer(ast);\n\nexport function selectHttpOptionsAndBody(\n operation: Operation,\n fallbackConfig: HttpConfig,\n ...configs: Array<HttpConfig>\n) {\n configs.unshift(fallbackConfig);\n return selectHttpOptionsAndBodyInternal(\n operation,\n defaultPrinter,\n ...configs,\n );\n}\n\nexport function selectHttpOptionsAndBodyInternal(\n operation: Operation,\n printer: Printer,\n ...configs: HttpConfig[]\n) {\n let options = {} as HttpConfig & Record<string, any>;\n let http = {} as HttpQueryOptions;\n\n configs.forEach(config => {\n options = {\n ...options,\n ...config.options,\n headers: {\n ...options.headers,\n ...config.headers,\n }\n };\n\n if (config.credentials) {\n options.credentials = config.credentials;\n }\n\n http = {\n ...http,\n ...config.http,\n };\n });\n\n if (options.headers) {\n options.headers = removeDuplicateHeaders(options.headers, http.preserveHeaderCase);\n }\n\n //The body depends on the http options\n const { operationName, extensions, variables, query } = operation;\n const body: Body = { operationName, variables };\n\n if (http.includeExtensions) (body as any).extensions = extensions;\n\n // not sending the query (i.e persisted queries)\n if (http.includeQuery) (body as any).query = printer(query, print);\n\n return {\n options,\n body,\n };\n};\n\n// Remove potential duplicate header names, preserving last (by insertion order).\n// This is done to prevent unintentionally duplicating a header instead of\n// overwriting it (See #8447 and #8449).\nfunction removeDuplicateHeaders(\n headers: Record<string, string>,\n preserveHeaderCase: boolean | undefined\n): typeof headers {\n\n // If we're not preserving the case, just remove duplicates w/ normalization.\n if (!preserveHeaderCase) {\n const normalizedHeaders = Object.create(null);\n Object.keys(Object(headers)).forEach(name => {\n normalizedHeaders[name.toLowerCase()] = headers[name];\n });\n return normalizedHeaders;\n }\n\n // If we are preserving the case, remove duplicates w/ normalization,\n // preserving the original name.\n // This allows for non-http-spec-compliant servers that expect intentionally\n // capitalized header names (See #6741).\n const headerData = Object.create(null);\n Object.keys(Object(headers)).forEach(name => {\n headerData[name.toLowerCase()] = { originalName: name, value: headers[name] }\n });\n\n const normalizedHeaders = Object.create(null);\n Object.keys(headerData).forEach(name => {\n normalizedHeaders[headerData[name].originalName] = headerData[name].value;\n });\n return normalizedHeaders;\n}\n"]} |