http

Experimental HTTP Client Example

NB: this example uses an experimental wasi-http that is part of the WASI specification but is still going through iteration. Expect breaking changes in future releases.

Building

dotnet build

Running

$ dotnet run
data from read: {
  "args": {},
  "headers": {
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443",
    "host": "postman-echo.com",
    "x-amzn-trace-id": "Root=1-647a242d-0700da8c2aeb9ed34390e69f",
    "user-agent": "WASI-HTTP/0.0.1",
    "content-type": "application/json"
  },
  "url": "https://postman-echo.com/get"
}
StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StringContent, Headers:
{
  Date:  Fri, 02 Jun 2023 17:17:33 GMT
  Set-Cookie:  sails.sid=s%3AIkf163sGfmOzI5ePigclF_529u-yb-iM.ZtP5UII4ZAdJiea%2BT4sKh5CAcFwDoJ%2F%2Bqsi13flMLzY; Path=/; HttpOnly
  Connection:  keep-alive
  ETag:  W/"13d-PU41PZI6y0DFxFj3/QP2IeKi4K4"
  Content-Type: application/json; charset=utf-8
  Content-Length: 317
}
{
  "args": {},
  "headers": {
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443",
    "host": "postman-echo.com",
    "x-amzn-trace-id": "Root=1-647a242d-0700da8c2aeb9ed34390e69f",
    "user-agent": "WASI-HTTP/0.0.1",
    "content-type": "application/json"
  },
  "url": "https://postman-echo.com/get"
}
data from read: {
  "args": {},
  "data": {
    "userId": 77,
    "id": 1,
    "title": "write code sample",
    "completed": false
  },
  "files": {},
  "form": {},
  "headers": {
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443",
    "host": "postman-echo.com",
    "x-amzn-trace-id": "Root=1-647a242e-38dd540d69fef19d1b4e5dff",
    "content-length": "66",
    "content-type": "application/json",
    "user-agent": "WASI-HTTP/0.0.1"
  },
  "json": {
    "userId": 77,
    "id": 1,
    "title": "write code sample",
    "completed": false
  },
  "url": "https://postman-echo.com/post"
}
StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StringContent, Headers:
{
  Set-Cookie:  sails.sid=s%3AG4QvfJFNkjxVo6HCPnYIjK1rzbMzK825.DEG15cFXX7r6G%2FBx4y2n8W2IE8jsNm4l1oulYIS9Us4; Path=/; HttpOnly
  ETag:  W/"249-bMTMd9tqmXVgIdv3EJJMJp5ixx4"
  Connection:  keep-alive
  Date:  Fri, 02 Jun 2023 17:17:34 GMT
  Content-Type: application/json; charset=utf-8
  Content-Length: 585
}
{
  "args": {},
  "data": {
    "userId": 77,
    "id": 1,
    "title": "write code sample",
    "completed": false
  },
  "files": {},
  "form": {},
  "headers": {
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443",
    "host": "postman-echo.com",
    "x-amzn-trace-id": "Root=1-647a242e-38dd540d69fef19d1b4e5dff",
    "content-length": "66",
    "content-type": "application/json",
    "user-agent": "WASI-HTTP/0.0.1"
  },
  "json": {
    "userId": 77,
    "id": 1,
    "title": "write code sample",
    "completed": false
  },
  "url": "https://postman-echo.com/post"
}

Regnerating code

proxy.h, proxy.c and proxy_component_type.o are all generated by wit-bindgen.

You probably don't need to regenerate, but if you do:

git clone https://github.com/WebAssembly/wasi-http
cd wasi-http
# corresponds to wasmtime 9.0.x
git checkout 244e068
/usr/local/lib/wit-bindgen c --world proxy ./wit

TODO

• Headers on the request are not currently supported.
• Validate no memory leaks.
• Expose more of the 'native' wasi-http interface?