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 container 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 container 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, the error code 404 is returned.

Use the cURL tool to access the HTTP function.

curl  -v  https://164901546557****.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test

Use a browser to access the HTTP function.
```
https://164901546557****.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test
```
Note The URL of the HTTP function is in the following format: https://<account_id>.<region_id>.fc.aliyuncs.com/<version>/proxy/<serviceName>/<functionName>/<path>.

Solutions

You can resolve this issue by using one of the following methods:

Access the function by using the subdomain that is assigned by Function Compute for the new HTTP trigger. For more information, see Step 3: Test the function.
Subdomain format:
```
https://<subdomain>.<region_id>.fcapp.run/[action?queries] 
```
Sample code:
```
https://funcname-svcname-khljsjksld.cn-shanghai.fcapp.run/action?hello=world
```

Add a header that is named x-fc-invocation-target to the command that is used to access the function. Command syntax:

curl -v -H "x-fc-invocation-target: 2016-08-15/proxy/$ServiceName/$functionName" https://<account_id>.<region_id>.fc.aliyuncs.com/$path

Sample code:

curl -v -H "x-fc-invocation-target: 2016-08-15/proxy/CustomDemo/func-http" https://164901546557****.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.
For example, if the domain name is example.com, the following command syntax is used:
```
curl -v  https://example.com/$path
```
Sample code:
```
curl -v  https://example.com/test
```
Important Replace /$path with the path from which a request can trigger the function in the service. The path is configured when you bind the custom domain. For more information, see Routing rules.

Modify your function code and deploy the function. Then, use the default URL to access the function. The following example shows the modified code:

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

Sample code:

curl  -v  https://164901546557****.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/CustomDemo/func-http/test