在具有节点服务器的React ApolloGraphQL应用程序中，当节点服务器关闭时，我试图使其捕获错误。当节点服务器启动时，一切正常且正常。捕获并显示graphQL错误。但是，当我停止节点服务器时，出现了我无法避免的运行时错误。当节点服务器关闭时，服务器将以503 Service Unavailable响应和不是JSON的html页面进行响应。
阿波罗客户端的设置如下：
const client = new ApolloClient({
assumeImmutableResults: true,
fetchOptions: {
credentials: "include"
},
fetch: fetch,
onError: ({ graphQLErrors, networkError }) => {
if (graphQLErrors)
graphQLErrors.map(({ message, locations, path }) =>
console.log(`[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`,),);
if (networkError) {console.log(`[Network error]: ${networkError}`);}
response = {errors:null};
},
cache: new InMemoryCache({
freezeResults: true,
dataIdFromObject: obj => {
let dataId = null;
switch (obj.__typename) {
default:
dataId = defaultDataIdFromObject(obj);
}
return dataId;
},
cacheRedirects: {
Query: {
productVariant: (_, args, { getCacheKey }) => {
const cacheKey = getCacheKey({ __typename: "ProductVariant", ...args });
return cacheKey;
}
}
},
}),
});
上述onError阻止此消息：
Error: Network error: JSON.parse: unexpected character at line 1 column 1 of the JSON data
我通过这种方式设置了突变：
const [mutateVariant, {data, error, loading}] = useMutation(UPDATE_PRODUCT_META);
而且我这样称呼它：
mutateVariant({ variables: {inputM: {...buildMetaInput(editedData)} },
errorPolicy: 'ignore', onError: (error) => Logger("Error:", error)});
您可以看到我已经使用不同的errorPolicy设置并添加了onError回调来进行尝试。
但是我一直在遇到无法处理的运行时错误，而且似乎无法捕获和处理它们：
Unhandled Runtime Error
Error: Network error: JSON.parse: unexpected character at line 1 column 1 of the JSON data
Call Stack
ApolloError webpack-internal:///./node_modules/apollo-client/bundle.esm.js (76:28)
error webpack-internal:///./node_modules/apollo-client/bundle.esm.js (1041:48)
notifySubscription webpack-internal:///./node_modules/zen-observable/lib/Observable.js (140:18)
onNotify webpack-internal:///./node_modules/zen-observable/lib/Observable.js (179:21)
error webpack-internal:///./node_modules/zen-observable/lib/Observable.js (240:15)
error/< webpack-internal:///./node_modules/apollo-client/bundle.esm.js (880:76)
error webpack-internal:///./node_modules/apollo-client/bundle.esm.js (880:27)
notifySubscription webpack-internal:///./node_modules/zen-observable/lib/Observable.js (140:18)
onNotify webpack-internal:///./node_modules/zen-observable/lib/Observable.js (179:21)
error webpack-internal:///./node_modules/zen-observable/lib/Observable.js (240:15)
error webpack-internal:///./node_modules/apollo-link-error/lib/bundle.esm.js (53:34)
notifySubscription webpack-internal:///./node_modules/zen-observable/lib/Observable.js (140:18)
onNotify webpack-internal:///./node_modules/zen-observable/lib/Observable.js (179:21)
error webpack-internal:///./node_modules/zen-observable/lib/Observable.js (240:15)
createHttpLink/</</< webpack-internal:///./node_modules/apollo-link-http/lib/bundle.esm.js (92:26)
从useMutation挂钩返回的error数据：
graphQLErrors: Array []
message: "Network error: JSON.parse: unexpected character at line 1 column 1 of the JSON data"
networkError: {…}
bodyText: "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>503 Service
Unavailable</title>\n</head><body>\n<h1>Service Unavailable</h1>\n<p>The server is temporarily unable
to service your\nrequest due to maintenance downtime or capacity\nproblems. Please try again later.
</p>\n<p>Additionally, a 503 Service Unavailable\nerror was encountered while trying to use an
ErrorDocument to handle the request.</p>\n</body></html>\n"
name: "ServerParseError"
response: Object { }
statusCode: 503
如何捕获此错误？
mutateVariant函数返回一个承诺。尝试在调用后添加.catch（）。
mutateVariant().catch(() => {...});