51 lines
2.0 KiB
Python
51 lines
2.0 KiB
Python
"""
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This script simply prints all received HTTP Trailers.
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HTTP requests and responses can contain trailing headers which are sent after
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the body is fully transmitted. Such trailers need to be announced in the initial
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headers by name, so the receiving endpoint can wait and read them after the
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body.
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"""
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from mitmproxy import http
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from mitmproxy.http import Headers
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def request(flow: http.HTTPFlow):
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if flow.request.trailers:
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print("HTTP Trailers detected! Request contains:", flow.request.trailers)
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if flow.request.path == "/inject_trailers":
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if flow.request.is_http10:
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# HTTP/1.0 doesn't support trailers
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return
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elif flow.request.is_http11:
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if not flow.request.content:
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# Avoid sending a body on GET requests or a 0 byte chunked body with trailers.
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# Otherwise some servers return 400 Bad Request.
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return
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# HTTP 1.1 requires transfer-encoding: chunked to send trailers
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flow.request.headers["transfer-encoding"] = "chunked"
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# HTTP 2+ supports trailers on all requests/responses
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flow.request.headers["trailer"] = "x-my-injected-trailer-header"
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flow.request.trailers = Headers([(b"x-my-injected-trailer-header", b"foobar")])
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print("Injected a new request trailer...", flow.request.headers["trailer"])
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def response(flow: http.HTTPFlow):
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assert flow.response
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if flow.response.trailers:
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print("HTTP Trailers detected! Response contains:", flow.response.trailers)
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if flow.request.path == "/inject_trailers":
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if flow.request.is_http10:
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return
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elif flow.request.is_http11:
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if not flow.response.content:
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return
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flow.response.headers["transfer-encoding"] = "chunked"
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flow.response.headers["trailer"] = "x-my-injected-trailer-header"
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flow.response.trailers = Headers([(b"x-my-injected-trailer-header", b"foobar")])
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print("Injected a new response trailer...", flow.response.headers["trailer"])
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