KeyError in flask web service

Question

I have created FLASK web service to upload an image but I'm getting an error when I try to call it using POSTMAN.

Getting an error

400 Bad Request: KeyError: 'file1'

But I am sure I have same key name at both the places.

My Code:

from flask import Flask, request
from scipy.stats import wasserstein_distance
import numpy as np
import cv2
from imutils import paths
from werkzeug.utils import secure_filename

app = Flask(__name__)


@app.route("/img", methods=['POST'])
def search():

    file = request.files['file1']
    filename = secure_filename(file.filename)
    file.save(filename)

    images = list(paths.list_images("data"))

    query_image = cv2.imread(filename)
    query_image = cv2.cvtColor(query_image, cv2.COLOR_BGR2GRAY)
    q_hist = get_histogram(query_image)

    hist = []

    for i in images:
        image = cv2.imread(i)

        # convert the images to grayscale
        image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

        s_hist = get_histogram(image)
        dist = wasserstein_distance(q_hist, s_hist)
        hist.append(dist)

    x = min(hist)
    print(hist)
    if x > 2:
        return "Image Not Found"
    else:
        idx = hist.index(x)
        matched_img = images[idx]
        return des[matched_img]


if __name__ == '__main__':
    app.run(debug=True)

This is how I am calling the web service using postman

Headers

How can I resolve this?

Try adding if request.method=='POST' as first line of function — Tech at The Sparks Foundation
– Tech at The Sparks Foundation, Commented May 16, 2019 at 18:19
Just for sake of confirming. Use curl.. curl -X POST -F file1=@"/path/to/my/file/a.jpg" localhost:5000/img — Tech at The Sparks Foundation
– Tech at The Sparks Foundation, Commented May 16, 2019 at 18:47
@TechatTheSparksFoundation Strange ...getting response here. — Sociopath
– Sociopath, Commented May 16, 2019 at 18:49
Yeah probably the postman isnt sending correct request. It appends temp headers which modifies your request and stops it from processing. Your code will work fine once you integrate it to front end. :) — Tech at The Sparks Foundation
– Tech at The Sparks Foundation, Commented May 16, 2019 at 18:50

Sociopath · Accepted Answer · 2019-05-16 18:57:30Z

2

Postman might be sending additional headers with your request. Just for sake of testing your code use curl..

curl -X POST -F file1=@"/path/to/my/file/a.jpg" http://localhost:5000/img

Probably the postman isn't sending the correct request. It appends temp headers which modifies your request and stops it from processing. Your code will work fine once you integrate it to the front end.

edited May 16, 2019 at 18:57

Sociopath

13.4k22 gold badges53 silver badges82 bronze badges

answered May 16, 2019 at 18:53

Tech at The Sparks Foundation

1,1312 gold badges8 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

KeyError in flask web service

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related