What do I do if a 404 error occurs when I use a browser or the cURL tool to access a function? - Function Compute

Symptoms

I create an HTTP function for a custom runtime. The service name is CustomDemo and the function name is func-http. An anonymous HTTP trigger is specified. The following sample routing code can be used to implement the HTTP server of the custom runtime:

@app.route('/test', methods = ['POST','GET'])
def test():

When I use the cURL tool or a browser to access the URL of the HTTP function, a 404 error occurs.

Use the cURL tool to access the HTTP function.

curl  -v  https://123456789.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test

Use a browser to access the HTTP function.
```
https://123456789.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test
```
Note The URL format of the HTTP function is https://$ACCOUNT_ID.$REGION.fc.aliyuncs.com/2016-08-15/proxy/$ServiceName/$functionName/$path.

Solutions

You can use one of the following methods to solve this problem:

Add a header named x-fc-invocation-target to the command. Command syntax:

curl -v -H "x-fc-invocation-target: 2016-08-15/proxy/$ServiceName/$functionName" https://$ACCOUNT_ID.$REGION.fc.aliyuncs.com/$path

A sample command:

curl -v -H "x-fc-invocation-target: 2016-08-15/proxy/CustomDemo/func-http" https://123456789.cn-hangzhou.fc.aliyuncs.com/test

Bind a custom domain name to the function. Then, run the following command to access the function again. For more information about how to bind a domain name, see Configure a custom domain name.
If the domain name is test.abc.com, the following command can be used:
```
curl -v  https://test.abc.com/$path
```
A sample command:
```
curl -v  https://test.abc.com/test
```
Important The path must be /*. The service name is CustomDemo and the function name is func-http.

Modify your function code and deploy the function. Then, use the default URL to access the function again. An example of modified function code:

@app.route('/2016-08-15/proxy/CustomDemo/func-http/test', methods = ['POST','GET'])
def test():

A sample command:

curl  -v  https://123456789.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test