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Mitmproxy received an absolute-form request error

See original GitHub issue

Steps to reproduce the problem:

tcpdump result:

CONNECT sample.domain.com:80 HTTP/1.1
Proxy-Connection: Keep-Alive
Connection: Keep-Alive
Host: sample.domain.com:80

HTTP/1.1 200 Connection established

POST http://sample.domain.com/ajax/info/info HTTP/1.1
User-Agent: Unity/5.4.3p4 (Mac OS X 10.12.3; MacBookPro12,1)
Host: sample.domain.com
Accept-Encoding: gzip, identity
Proxy-Connection: Keep-Alive
Connection: Keep-Alive, TE
TE: identity
Content-Length: 0
Cookie: apv=1.0; abc=; abd=; abe=

HTTP/1.1 400 Bad Request
Server: mitmproxy 2.0.0
Connection: close
Content-Length: 436
Content-Type: text/html

<html>
            <head>
                <title>400 Bad Request</title>
            </head>
            <body>
            <h1>400 Bad Request</h1>
            <p>HttpException(&#x27;Mitmproxy received an absolute-form request even though it is not running in regular mode. This usually indicates a misconfiguration, please see http://docs.mitmproxy.org/en/stable/modes.html for details.&#x27;,)</p>
            </body>
        </html>HTTP/1.1 502 Bad Gateway
Server: mitmproxy 2.0.0
Connection: close
Content-Length: 479
Content-Type: text/html

<html>
            <head>
                <title>502 Bad Gateway</title>
            </head>
            <body>
            <h1>502 Bad Gateway</h1>
            <p>ProtocolException(&#x27;HTTP protocol error in client request: Mitmproxy received an absolute-form request even though it is not running in regular mode. This usually indicates a misconfiguration, please see http://docs.mitmproxy.org/en/stable/modes.html for details.&#x27;,)</p>
            </body>
        </html>

Any other comments? What have you tried so far?

I fixed this temporarily with https://github.com/mitmproxy/mitmproxy/blob/83f1e2eec01ab3edec723b252b0c109f00b77c56/mitmproxy/proxy/root_context.py#L100

- return protocol.Http1Layer(top_layer, http.HTTPMode.transparent)
+ return protocol.Http1Layer(top_layer, http.HTTPMode.regular)

System information

Mitmproxy version: 2.0.0 (release version) Python version: 3.6.0 Platform: Darwin-16.4.0-x86_64-i386-64bit SSL version: OpenSSL 1.1.0e 16 Feb 2017 Mac version: 10.12.3 (‘’, ‘’, ‘’) x86_64

Issue Analytics

State:
Created 7 years ago
Comments:7 (4 by maintainers)

Top GitHub Comments

2reactions

sk3lk0commented, Dec 18, 2019

–relax-http-form-validation not working

1reaction

Kriechicommented, Mar 1, 2017

Yes, this is what most clients do. They send a CONNECT with the host they need a connection to, and then they only send relative paths.

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