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A consumer of my REST API says that on occasion I am returning a 400 Bad Request - The request sent by the client was syntactically incorrect. error.
My application (Python/Flask) logs don't seem to be capturing this, and neither do my webserver/Nginx logs.
Edit: I would like to try to cause a 400 bad request in Flask for debugging purposes. How can I do this?
Following James advice, I added something similar to the following:
@app.route('/badrequest400') def bad_request(): return abort(400) When I call this, flask returns the following HTML, which doesn't use the "The request sent by the client was syntactically incorrect" line:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <title>400 Bad Request</title> <h1>Bad Request</h1> <p>The browser (or proxy) sent a request that this server could not understand.</p> (I'm not sure why it isn't including the <body> tags.
It appears to me that there are different variations of the 400 error message. For example, if I set a cookie to a value of length 50,000 (using Interceptor with Postman), I'll get the following error from Flask instead:
<html> <head> <title>Bad Request</title> </head> <body> <h1> <p>Bad Request</p> </h1> Error parsing headers: 'limit request headers fields size' </body> </html> Is there a way to get Flask to through the different variations of 400 errors?
932
400 (Bad Request) 400 is the generic client-side error status, used when no other 4xx error code is appropriate. Errors can be like malformed request syntax, invalid request message parameters, or deceptive request routing etc. The client SHOULD NOT repeat the request without modifications.
The HTTP status 400 – bad request indicates that the request sent to the server is invalid or corrupted. Just like other 4xx status codes, a 400 bad request is a client-side issue. It can be caused by malformed request syntax, invalid request message framing, or deceptive request routing.
Flask uses the term context local for this. Flask automatically pushes a request context when handling a request. View functions, error handlers, and other functions that run during a request will have access to the request proxy, which points to the request object for the current request.
you can return the status code as a second parameter of the return, see example below
@app.route('/my400') def my400(): code = 400 msg = 'my message' return msg, code You can use abort to raise an HTTP error by status code.
from flask import abort @app.route('/badrequest400') def bad_request(): abort(400) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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