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Explain how to fix 'httpd_parse: header too long'

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Because this is the 'simple' server example, it is probably where users will start out to understand the HTTP Server API; and also where they might come if they are having problems.
So I think it is useful to explain to users what to do if they see "httpd_parse: parse_block: request URI/header too long", which can easily happen if they submit a POST from an HTML form (for example). That certainly would have helped me!

Merges https://github.com/espressif/esp-idf/pull/6547

Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>
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mjcross
2021-02-15 21:08:29 +00:00
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examples/protocols/http_server/simple/README.md
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@@ -20,5 +20,7 @@ The Example consists of HTTPD server demo with demostration of URI handling :
* since the server echoes back the request body, the two files should be same, as can be confirmed using : "cmp anyfile tmpfile" * since the server echoes back the request body, the two files should be same, as can be confirmed using : "cmp anyfile tmpfile"
3. "curl -X PUT -d "0" 192.168.43.130:80/ctrl" - disable /hello and /echo handlers 3. "curl -X PUT -d "0" 192.168.43.130:80/ctrl" - disable /hello and /echo handlers
4. "curl -X PUT -d "1" 192.168.43.130:80/ctrl" - enable /hello and /echo handlers 4. "curl -X PUT -d "1" 192.168.43.130:80/ctrl" - enable /hello and /echo handlers
* If the server log shows "httpd_parse: parse_block: request URI/header too long", especially when handling POST requests, then you probably need to increase HTTPD_MAX_REQ_HDR_LEN, which you can find in the project configuration menu (`idf.py menuconfig`): Component config -> HTTP Server -> Max HTTP Request Header Length
See the README.md file in the upper level 'examples' directory for more information about examples. See the README.md file in the upper level 'examples' directory for more information about examples.