英文:
Multi-Line Strings As Parameters
问题
Express.js代码接受参数的部分：
app.get('/:prompt', async (req, res) => {
const prompt = req.query.prompt;
// 使用prompt进行某些操作并发送响应
}
客户端JavaScript代码试图发送多行字符串的部分：
export function btn_click() {
console.log('Clicked')
const prompt = $w("#textBox1").value
// console.log(typeof prompt);
const Orignal_URL = 'https://11bf-2401-4900-1f35-97fc-68a4-6e62-bb93-34d5.in.ngrok.io/';
const URL = Orignal_URL.concat(prompt)
console.log(URL);
fetch(URL, { method: 'get' })
.then(res => res.json())
.then(ans => {
console.log(ans);
const blank = $w("#text3");
if (ans['Answer'] === undefined){
blank.text = '请提供所需的信息';
}
else {
blank.text = String(ans['Answer']);
}
blank.show()
});
}
当我发送多行字符串作为参数时，变量"prompt"等于"undefined"。如何解决这个问题？
英文:
How can you pass multi-line strings (with spaces and tabs) as a parameter to an express server?
Express.js code that accepts the parameter :
app.get('/:prompt', async (req, res) => {
const prompt = req.query.prompt;
// Do something with the prompt and send a response
}
Client-Side Javascript code that tries to send a multi-line string :
export function btn_click() {
console.log('Clicked')
const prompt = $w("#textBox1").value
// console.log(typeof prompt);
const Orignal_URL = 'https://11bf-2401-4900-1f35-97fc-68a4-6e62-bb93-34d5.in.ngrok.io/';
const URL = Orignal_URL.concat(prompt)
console.log(URL);
fetch(URL, { method: 'get' })
.then(res => res.json())
.then(ans => {
console.log(ans);
const blank = $w("#text3");
if (ans['Answer'] === undefined){
blank.text = 'Please enter the required information';
}
else {
blank.text = String(ans['Answer']);
}
blank.show()
});
}
When I send a multi-line string as the parameter, the variable "prompt" is equal to "undefined". How do I solve this?
Update: Added the code that sends a request with the string for more clarity
答案1
得分: 2
一个URL不能包含换行符。HTTP资源名称必须是单行字符串，也不应包含空格。要解决这个限制，您需要通过encodeURIComponent对提示参数进行URL编码：
const url = `https://example.org/app/${ encodeURIComponent(prompt) }`;
要在Express.js中获取这个值，您可以使用路由参数，并通过req.params自动解码它。请注意，您需要使用(*)来允许参数中的斜杠：
app.get('/app/:prompt(*)', async (req, res) => {
const prompt = req.params.prompt;
// 对提示执行某些操作并发送响应
});
或者，您可以（并且可能应该）使用URL查询字符串参数发送该值：
const url = `https://example.org/app?prompt=${ encodeURIComponent(prompt) }`;
在Express.js中，您可以使用req.query（正如您所做的那样）来访问它：
app.get('/app', async (req, res) => {
const prompt = req.query.prompt;
// 对提示执行某些操作并发送响应
});
英文:
An URL cannot contain newlines. A HTTP resource name must be a single-line string and should not contain spaces either.
To work around this limitation, you need to URL encode the prompt parameter via encodeURIComponent:
const url = `https://example.org/app/${ encodeURIComponent(prompt) }`;
To get this value in Express.js, you can use a route parameter and access it via req.params which will automatically decode it. Notice that you need to use (*) to allow slashes in the parameter:
app.get('/app/:prompt(*)', async (req, res) => {
const prompt = req.params.prompt;
// Do something with the prompt and send a response
});
Alternatively, you can (and probably should) send the value using an URL query string parameter:
const url = `https://example.org/app?prompt=${ encodeURIComponent(prompt) }`;
In Express.js, you use req.query (as you did) to access it:
app.get('/app', async (req, res) => {
const prompt = req.query.prompt;
// Do something with the prompt and send a response
});
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