Anvil HTTP Error StreamingMedia

Anvil Q&A
1

The anvil http requests library seems to behave quite different to the normal python requests package.
for example:
import json
import anvil.http
import anvil.server

 data = requests.get(url)
 result = data.json().get('result')

works perfectly fine, but

 data = anvil.http.request(url)
 result = data.json().get('result')

logs the following error: AnvilWrappedError: ‘StreamingMedia’ object has no attribute ‘json’
While

 data = anvil.http.request(url,json=True)

returns a dict not a json which is confusing but manageable.

But am getting similar issues while trying to create an endpoint that recieves json. anvil.server.body will return a plain text of the request (not in json), but anvil.server.body_json returns None.
When trying to perform methods on anvil.server.body, i get the same AnvilWrappedError: ‘StreamingMedia’ object has no attribute ‘json’ or while using it as a dict ‘StreamingMedia’ object is not subscriptable.

What is this StreamingMedia object and how can i perform typical methods and operations with anvil?

2

If I remember correctly, this same issue came up here:

3

thanks, any info regarding the endpoints?

4

Here are the docs on endpoints.

https://anvil.works/docs/http-apis/creating-http-endpoints

5

ive already read through those and no help.
I need to receive a json post request.

anvil.server.body_json returns None
and anvil.server.body returns StreamingmMedia errors.
this returns none
@anvil.server.http_endpoint(’/testendpoint’,methods=‘POST’)
def test():
data = anvil.server.request.body_json

this returns a bizzare plain text media object and cannot perform any operations/methods on it:
@anvil.server.http_endpoint(’/testendpoint’,methods=‘POST’)
def test():
data = anvil.server.request.body

data.content_type gives either plain/text utc-8 when data=anvil.server.body, or
data.content_type gives AttributeError: ‘NoneType’ object has no attribute ‘content_type’ when data = anvil.server.body_json

7

If the plain text is in JSON format, then, once you extract the text, you should be able to use standard Python library routines to convert it into the in-Python equivalent: e.g., a list or dict.

At least, as a workaround, until the real problem is found.

1 Like
8

Hi @bdr997,

anvil.server.request.body_json should be what you’re after. The following is working for me:

Server Module code:

import anvil.server
import anvil.http

@anvil.server.http_endpoint('/testendpoint', methods=['POST'])
def test():
  body_json = anvil.server.request.body_json
  print(f"Body json: {body_json}")
  print(f"Content type: {anvil.server.request.body.content_type}")
  return anvil.server.HttpResponse(200, "Request received")

Json POST request:

curl --header "Content-Type: application/json" \
  --request POST \
  --data '{"username":"xyz","password":"xyz"}' \
  https://artistic-downright-contest.anvil.app/_/api/testendpoint

Looking at the app logs, I get the following output:

Incoming API request from Cambridge, United Kingdom.
Body json: {'username': 'xyz', 'password': 'xyz'}
Content type: application/json
3 Likes