Re: Failed to use MathpixOCR JSON API with curl.

From: Hongyi Zhao via curl-users <curl-users_at_cool.haxx.se>
Date: Wed, 9 Jun 2021 22:01:02 +0800

On Wed, Jun 9, 2021 at 5:52 PM Jeremy Nicoll via curl-users
<curl-users_at_cool.haxx.se> wrote:
>
> On Wed, 9 Jun 2021, at 04:15, Hongyi Zhao via curl-users wrote:
> > According to the instruction given on the MathpixOCR API official
> > website here, <https://docs.mathpix.com/#request-parameters>, as shown
> > below:
> >
> > curl -X POST https://api.mathpix.com/v3/text \
> > -H 'app_id: YOUR_APP_ID' \
> > -H 'app_key: YOUR_APP_KEY' \
> > -H 'Content-Type: application/json' \
> > --data '{ "src": "data:image/jpeg;base64,'$(base64 -i limit.jpg)'" }'
> >
> > I use the following code with my own app_id and app_key to test the
> > OCR accuracy of MathpixOCR:
> >
> > $ curl -x socks5://127.0.0.1:18888 -X POST
> > https://api.mathpix.com/v3/latex -H 'app_id: my_app_id' -H
> > 'app_key: my_app_key' -H 'Content-Type: application/json'
> > --data '{ "url": "data:image/jpg;base64, '$(base64 -i
> > schrodinger.png)'" }'
> > {"error":"SyntaxError: Unexpected end of JSON
>
> Does it matter that despite the webpage saying that the --data value
> should start with "src", you used "url"?

Both of them will work. See following.

>
> Have you tried checking the syntax of your JSON parameters, either
> at an online JSON unscrambling/formatting page, or in your own code?
>
>
> > From my point of view, the test example
> > of mine is exatly same with the official sample code.
>
> It clearly is not. But I have no idea if the difference matters.

Thank you for your comments. Based on some further tries, I find that
the following shell variable substitute method for the HTTP POST data
block will work:

$ cat test.sh
echo === src ===

curl -x socks5://127.0.0.1:18888 -X POST
https://api.mathpix.com/v3/text -H 'app_id: my_app_id' -H 'app_key:
my_app_key' -H 'Content-Type: application/json' --data "$(echo '{
"src": "data:image/jpeg;base64,'$(base64 -i schrodinger.png
2>/dev/null)'" }' )"

echo

echo === url ===
curl -x socks5://127.0.0.1:18888 -X POST
https://api.mathpix.com/v3/text -H 'app_id: my_app_id' -H 'app_key:
my_app_key' -H 'Content-Type: application/json' --data "$(echo '{
"url": "data:image/jpeg;base64,'$(base64 -i schrodinger.png
2>/dev/null)'" }' )"

echo

$ bash test.sh
=== src ===
{"request_id":"c19708139a07604fd010b084a614b82a","is_printed":true,"is_handwritten":false,"auto_rotate_confidence":0.00018956642596990037,"auto_rotate_degrees":0,"confidence":1,"confidence_rate":1,"latex_styled":"i
\\hbar \\frac{\\partial}{\\partial t} \\Psi(x,
t)=\\left[-\\frac{\\hbar^{2}}{2 m} \\frac{\\partial^{2}}{\\partial
x^{2}}+V(x, t)\\right] \\Psi(x, t)","text":"\\( i \\hbar
\\frac{\\partial}{\\partial t} \\Psi(x,
t)=\\left[-\\frac{\\hbar^{2}}{2 m} \\frac{\\partial^{2}}{\\partial
x^{2}}+V(x, t)\\right] \\Psi(x, t) \\)"}
=== url ===
{"request_id":"16816daf8205f68b58ff17a938cff56b","is_printed":true,"is_handwritten":false,"auto_rotate_confidence":0.00018956642596990037,"auto_rotate_degrees":0,"confidence":1,"confidence_rate":1,"latex_styled":"i
\\hbar \\frac{\\partial}{\\partial t} \\Psi(x,
t)=\\left[-\\frac{\\hbar^{2}}{2 m} \\frac{\\partial^{2}}{\\partial
x^{2}}+V(x, t)\\right] \\Psi(x, t)","text":"\\( i \\hbar
\\frac{\\partial}{\\partial t} \\Psi(x,
t)=\\left[-\\frac{\\hbar^{2}}{2 m} \\frac{\\partial^{2}}{\\partial
x^{2}}+V(x, t)\\right] \\Psi(x, t) \\)"}

But I still can't figure out why the HTTP POST data block must be
passed this way.

Regards

-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao_at_gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China
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Received on 2021-06-09