Google Gen2 Cloud Function上传10MB+文件触发413请求过大错误排查

我正尝试通过API Gateway调用Google Gen2 Cloud Function，以POST请求将文件上传至GCS。所有文件大小均小于32MB，但上传10MB及以上文件时，会触发错误：413 Request Entity Too Large: The data value transmitted exceeds the capacity limit.

根据官方文档，Gen2 Cloud Function的最大HTTP请求大小为32MB，但实际仍无法读取上传的大文件。

示例代码 #

import functions_framework

@functions_framework.http
def main(request):
    """HTTP Cloud Function.
    Args:
    request (flask.Request): The request object.
    <https://flask.palletsprojects.com/en/1.1.x/api/#incoming-request-data>
    Returns:
    The response text, or any set of values that can be turned into a
    Response object using `make_response`
    <https://flask.palletsprojects.com/en/1.1.x/api/#flask.make_response>.
    """

    try:
        request_json = request.get_json(silent=True)
        request_args = request.args
        
        print(request.files.get('file').content_type)
        print(request.headers['Fullfilepath'])

        if request_json and 'name' in request_json:
            name = request_json['name']
        elif request_args and 'name' in request_args:
            name = request_args['name']
        else:
            name = 'World'
        return 'Hello {}!'.format(name)
    except Exception as e:
        print(e)
        return "Something went wrong", 500


if __name__ == "__main__":
    main()

注：文件大小低于10MB时可正常运行

请问为何Gen2 Cloud Function会出现此问题？

补充信息 #

我使用Postman发起API调用，以下是Postman生成的cURL请求片段：

curl --location --request POST 'https://<gen2-function-url>' \
--header 'Fullfilepath: myFile.xlsx' \
--form 'file=@"/C:/Users/jithin/Downloads/myFile.xlsx"'

CURL OUTPUT (小于10MB - 正常运行): #

*   Trying 216.249.35.23:443...
* TCP_NODELAY set
* Connected to <gen2-fn> 
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=*.a.run.app
*  start date: Sep 26 08:18:32 2022 GMT
*  expire date: Dec 19 08:18:31 2022 GMT
*  subjectAltName: host "<gen2-fn>" matched cert's "*.a.run.app"
*  issuer: C=US; O=Google Trust Services LLC; CN=GTS CA 1C3
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x6587b7c0)
> POST / HTTP/2
> Host: <gen2-fn>
> user-agent: curl/7.68.0
> accept: */*
> fullfilepath:myFile.xlsx
> content-length: 133134
> content-type: multipart/form-data; boundary=------------------------4aa0493a972a819f
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
* We are completely uploaded and fine
< HTTP/2 200
< content-type: text/html; charset=utf-8
< x-cloud-trace-context: ac66dub6c7d036958f95o05;o=1
< date: Wed, 02 Nov 2022 08:48:59 GMT
< server: Google Frontend
< content-length: 12
< alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"
<
* Connection #0 to host <gen2-fn> left intact
Hello World!% 

CURL OUTPUT (大于10MB - 运行失败): #

*   Trying 216.249.35.23:443...
* TCP_NODELAY set
* Connected to <gen2-fn>
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=*.a.run.app
*  start date: Oct 17 08:15:34 2022 GMT
*  expire date: Jan  9 08:15:33 2023 GMT
*  subjectAltName: host "<gen2-fn>" matched cert's "*.a.run.app"
*  issuer: C=US; O=Google Trust Services LLC; CN=GTS CA 1C3
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x5432697c0)
> POST / HTTP/2
> Host: <gen2-fn>
> user-agent: curl/7.68.0
> accept: */*
> fullfilepath:myFile1.xlsx
> content-length: 16492439
> content-type: multipart/form-data; boundary=------------------------d75d043c4ffd6fce
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
* We are completely uploaded and fine
< HTTP/2 500
< content-type: text/html; charset=utf-8
< x-cloud-trace-context: 464039806234sdf503247ec892803a20;o=1
< date: Wed, 02 Nov 2022 08:48:21 GMT
< server: Google Frontend
< content-length: 20
< alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"
<
* Connection #0 to host <gen2-fn> left intact
Something went wrong% 

内容的提问来源于stack exchange，提问作者Jithin Joseph