使旧链接快速向后兼容

Question

您有一个以express和angular创建的应用程序，允许用户执行搜索。该URL基于刚执行的搜索而构建。因此，如果您在“Will”上执行搜索，则该网址看起来像http://localhost.com:9000/search/query?q=Will一切正常，但您忘记了该应用以前执行的搜索没有/query?=，现在所有旧链接如http://localhost.com:9000/search/will或http://localhost.com:9000/search/roberto都不再有效。

什么是正确的方法让旧的链接再次工作？

如果您在前端使用JavaScript查找/查询？=在URL中丢失并在搜索路径之后但在查询文本之前添加？

Answer 1

只需使用正则表达式和重定向

app.use(function(req, res, next) { 
    var searchRegEx = /\/search/g; 
    var searchedTerm = req.originalUrl.replace(searchRegEx, ''); 
    var queryPath = req.originalUrl.match(/\/query[?]q=/); 
    if(!queryPath) { 
     var regexSlash = /\//g; 
     res.redirect('query?q=' + searchedTerm.replace(regexSlash, '')); 
    } 
    else { 
     next(); 
    } 
}); 

Answer 2

在Express后端执行重定向会更容易。

说你对/search/query路径代码最初是这样的：

app.get("/search/query", function (req, res) { 
    // Do your query validation and fetch your search result. 
    // Here, I just check if a query value was given or not for the q param. 
    // I recommend you use better ways to check for empty queries. 
    // (ex: lodash's `isEmpty()` function) 
    if (req.query.q) { 
     // Serve the page ! 
     res.send("What you want to render if the search result finds something."); 
    } 
    else { 
     // Return an error ! 
     res.status(404).send("Nothing was found with the criterias entered."); 
    } 
}); 

这可能是类似于你有什么。现在，这里是回答你的问题，根据上述初步实现：

app.get("/search/query", function (req, res, next) { 
    // Check if a query value was given AND if the value isn't equal to "query". 
    // The later condition is to prevent infinite loops. 
    if (req.query.q && req.query.q !== "query") { 
     // Redirect using the value assigned to the q query param. 
     res.redirect("/search/" + req.query.q); 
    } 
    else { 
     // Since there is no query parameter named `q` in the request, 
     // we can be sure that `query` reffers to a search term. 
     next(); 
    } 
}); 

app.param("srchterm", function (req, res, next, value) { 
    // Check, for example, if the value isn't empty. 
    if (value) { 
     // Do your query validation and fetch your search result HERE. 
     // Add those results in an array in the res.locals object. 
     // Those results can be used later. 
     res.locals.results = ["all", "your", "search", "results"]; 
    } 
    next(); 
}); 

app.get("/search/:srchterm", function (req, res) { 
    console.log("another blah"); 
    // We don't need to fetch the data here anymore, since it's handled by the param parser above! 
    // However, it's still necessary to check if the search gave back some results. 
    if (res.locals.results) { 
     // Serve the results ! 
     res.send("A total of " + res.locals.results.length + " results were found for " + req.params['srchterm']); 
    } 
    else { 
     // Return an error ! 
     res.status(404).send("Nothing was found with the criterias entered."); 
    } 
}); 

从现在开始

因此，使用/search/query?q=123每个查询将朝着/search/123重定向。它甚至可以让您使用query作为搜索词！