René's URL Explorer Experiment


Title: fix: Handle SSE Disconnects Properly When use starlette middleware by wenxuwan · Pull Request #1222 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: Handle SSE Disconnects Properly When use starlette middleware by wenxuwan · Pull Request #1222 · modelcontextprotocol/python-sdk

X Title: fix: Handle SSE Disconnects Properly When use starlette middleware by wenxuwan · Pull Request #1222 · modelcontextprotocol/python-sdk

Description: Motivation and Context When using the Starlette middleware capabilities, if the SSE client disconnects, the current server will return starlette.responses.Response, and the Response will send a message of type "http.response.start", which will cause the following error： File "/opt/anaconda3/lib/python3.12/contextlib.py", line 158, in __exit__ self.gen.throw(value) File "/Users/wangwenxue/code/gitlab/sofapyapp/myenv/lib/python3.12/site-packages/starlette/_utils.py", line 83, in collapse_excgroups raise exc File "/Users/wangwenxue/code/gitlab/sofapyapp/myenv/lib/python3.12/site-packages/starlette/middleware/base.py", line 185, in __call__ await response(scope, wrapped_receive, send) File "/Users/wangwenxue/code/gitlab/sofapyapp/myenv/lib/python3.12/site-packages/starlette/middleware/base.py", line 223, in __call__ async for chunk in self.body_iterator: File "/Users/wangwenxue/code/gitlab/sofapyapp/myenv/lib/python3.12/site-packages/starlette/middleware/base.py", line 169, in body_stream assert message["type"] == "http.response.body", f"Unexpected message: {message}" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AssertionError: Unexpected message: {'type': 'http.response.start', 'status': 200, 'headers': [(b'content-length', b'0')]} There are several issues that should be related to this PR, such as: #883 PrefectHQ/fastmcp#858 How Has This Been Tested? Tested manually and ensured that the route was closed when clients close the connection. Breaking Changes No Types of changes Bug fix (non-breaking change which fixes an issue) New feature (non-breaking change which adds functionality) Breaking change (fix or feature that would cause existing functionality to change) Documentation update Checklist I have read the MCP Documentation My code follows the repository's style guidelines New and existing tests pass locally I have added appropriate error handling I have added or updated documentation as needed Additional context

Open Graph Description: Motivation and Context When using the Starlette middleware capabilities, if the SSE client disconnects, the current server will return starlette.responses.Response, and the Response will send a me...

X Description: Motivation and Context When using the Starlette middleware capabilities, if the SSE client disconnects, the current server will return starlette.responses.Response, and the Response will send a me...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1222

X: @github

direct link

Domain: github.com

route-pattern/:user_id/:repository/pull/:id/files(.:format)
route-controllerpull_requests
route-actionfiles
fetch-noncev2:050f38a1-d39e-22ba-265b-5242a0a7e58f
current-catalog-service-hashae870bc5e265a340912cde392f23dad3671a0a881730ffdadd82f2f57d81641b
request-idBF94:1712DC:A131742:D8E84B0:6A5E8748
html-safe-nonce960ad70feab1cb12c53f92fd1abe9b13baa24f5aa40d4c9746cc90e2dc5b6ac4
visitor-payloadeyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJCRjk0OjE3MTJEQzpBMTMxNzQyOkQ4RTg0QjA6NkE1RTg3NDgiLCJ2aXNpdG9yX2lkIjoiMTA2NzkwMzE1NzA0ODA4NDI5NiIsInJlZ2lvbl9lZGdlIjoiaWFkIiwicmVnaW9uX3JlbmRlciI6ImlhZCJ9
visitor-hmac64572c17ad7f60c4e269ed5fe999cbc6ccd9ef128c4a7846298cc5ed0032be2b
hovercard-subject-tagpull_request:2710387756
github-keyboard-shortcutsrepository,pull-request-list,pull-request-conversation,pull-request-files-changed,copilot
google-site-verificationApib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I
octolytics-urlhttps://collector.github.com/github/collect
analytics-location///pull_requests/show/files
fb:app_id1401488693436528
apple-itunes-appapp-id=1477376905, app-argument=https://github.com/modelcontextprotocol/python-sdk/pull/1222/files
twitter:imagehttps://avatars.githubusercontent.com/u/11661906?s=400&v=4
twitter:cardsummary_large_image
og:imagehttps://avatars.githubusercontent.com/u/11661906?s=400&v=4
og:image:altMotivation and Context When using the Starlette middleware capabilities, if the SSE client disconnects, the current server will return starlette.responses.Response, and the Response will send a me...
og:site_nameGitHub
og:typeobject
hostnamegithub.com
expected-hostnamegithub.com
Nonee0c30ec4bc4cc128be7eee7ef869507723a2ac9916267b7e0d370b3580a5e7ba
turbo-cache-controlno-preview
diff-viewunified
go-importgithub.com/modelcontextprotocol/python-sdk git https://github.com/modelcontextprotocol/python-sdk.git
octolytics-dimension-user_id182288589
octolytics-dimension-user_loginmodelcontextprotocol
octolytics-dimension-repository_id862584018
octolytics-dimension-repository_nwomodelcontextprotocol/python-sdk
octolytics-dimension-repository_publictrue
octolytics-dimension-repository_is_forkfalse
octolytics-dimension-repository_network_root_id862584018
octolytics-dimension-repository_network_root_nwomodelcontextprotocol/python-sdk
turbo-body-classeslogged-out env-production page-responsive
disable-turbotrue
browser-stats-urlhttps://api.github.com/_private/browser/stats
browser-errors-urlhttps://api.github.com/_private/browser/errors
release68ef39d284f7f48d37e751bc9bc0a9a4166228d5
ui-targetfull
theme-color#1e2327
color-schemelight dark

Links:

Skip to contenthttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files#start-of-content
https://github.com/
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmodelcontextprotocol%2Fpython-sdk%2Fpull%2F1222%2Ffiles
GitHub CopilotWrite better code with AIhttps://github.com/features/copilot
GitHub Copilot appDirect agents from issue to mergehttps://github.com/features/ai/github-app
MCP RegistryNewIntegrate external toolshttps://github.com/mcp
ActionsAutomate any workflowhttps://github.com/features/actions
CodespacesInstant dev environmentshttps://github.com/features/codespaces
IssuesPlan and track workhttps://github.com/features/issues
Code ReviewManage code changeshttps://github.com/features/code-review
Code QualityEnforce quality at mergehttps://github.com/features/code-quality
GitHub Advanced SecurityFind and fix vulnerabilitieshttps://github.com/security/advanced-security
Code securitySecure your code as you buildhttps://github.com/security/advanced-security/code-security
Secret protectionStop leaks before they starthttps://github.com/security/advanced-security/secret-protection
Why GitHubhttps://github.com/why-github
Documentationhttps://docs.github.com
Bloghttps://github.blog
Changeloghttps://github.blog/changelog
Marketplacehttps://github.com/marketplace
View all featureshttps://github.com/features
Enterpriseshttps://github.com/enterprise
Small and medium teamshttps://github.com/team
Startupshttps://github.com/enterprise/startups
Nonprofitshttps://github.com/solutions/industry/nonprofits
App Modernizationhttps://github.com/solutions/use-case/app-modernization
DevSecOpshttps://github.com/solutions/use-case/devsecops
DevOpshttps://github.com/solutions/use-case/devops
CI/CDhttps://github.com/solutions/use-case/ci-cd
View all use caseshttps://github.com/solutions/use-case
Healthcarehttps://github.com/solutions/industry/healthcare
Financial serviceshttps://github.com/solutions/industry/financial-services
Manufacturinghttps://github.com/solutions/industry/manufacturing
Governmenthttps://github.com/solutions/industry/government
View all industrieshttps://github.com/solutions/industry
View all solutionshttps://github.com/solutions
AIhttps://github.com/resources/articles?topic=ai
Software Developmenthttps://github.com/resources/articles?topic=software-development
DevOpshttps://github.com/resources/articles?topic=devops
Securityhttps://github.com/resources/articles?topic=security
View all topicshttps://github.com/resources/articles
Customer storieshttps://github.com/customer-stories
Events & webinarshttps://github.com/resources/events
Ebooks & reportshttps://github.com/resources/whitepapers
Business insightshttps://github.com/solutions/executive-insights
GitHub Skillshttps://skills.github.com
Documentationhttps://docs.github.com
Customer supporthttps://support.github.com
Community forumhttps://github.com/orgs/community/discussions
Trust centerhttps://github.com/trust-center
Partnershttps://github.com/partners
View all resourceshttps://github.com/resources
GitHub SponsorsFund open source developershttps://github.com/open-source/sponsors
Security Labhttps://securitylab.github.com
Maintainer Communityhttps://maintainers.github.com
Acceleratorhttps://github.com/open-source/accelerator
GitHub Starshttps://stars.github.com
Archive Programhttps://archiveprogram.github.com
Topicshttps://github.com/topics
Trendinghttps://github.com/trending
Collectionshttps://github.com/collections
Enterprise platformAI-powered developer platformhttps://github.com/enterprise
GitHub Advanced SecurityEnterprise-grade security featureshttps://github.com/security/advanced-security
Copilot for BusinessEnterprise-grade AI featureshttps://github.com/features/copilot/copilot-business
Premium SupportEnterprise-grade 24/7 supporthttps://github.com/enterprise/premium-support
Pricinghttps://github.com/pricing
Search syntax tipshttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
documentationhttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmodelcontextprotocol%2Fpython-sdk%2Fpull%2F1222%2Ffiles
Sign up https://github.com/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fpull_requests%2Fshow%2Ffiles&source=header-repo&source_repo=modelcontextprotocol%2Fpython-sdk
Reloadhttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Reloadhttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Reloadhttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
modelcontextprotocol https://github.com/modelcontextprotocol
python-sdkhttps://github.com/modelcontextprotocol/python-sdk
Notifications https://github.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Fork 3.7k https://github.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Star 23.7k https://github.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk
Code https://github.com/modelcontextprotocol/python-sdk
Issues 263 https://github.com/modelcontextprotocol/python-sdk/issues
Pull requests 309 https://github.com/modelcontextprotocol/python-sdk/pulls
Actions https://github.com/modelcontextprotocol/python-sdk/actions
Projects https://github.com/modelcontextprotocol/python-sdk/projects
Models https://github.com/modelcontextprotocol/python-sdk/models
Security and quality 6 https://github.com/modelcontextprotocol/python-sdk/security
Insights https://github.com/modelcontextprotocol/python-sdk/pulse
Code https://github.com/modelcontextprotocol/python-sdk
Issues https://github.com/modelcontextprotocol/python-sdk/issues
Pull requests https://github.com/modelcontextprotocol/python-sdk/pulls
Actions https://github.com/modelcontextprotocol/python-sdk/actions
Projects https://github.com/modelcontextprotocol/python-sdk/projects
Models https://github.com/modelcontextprotocol/python-sdk/models
Security and quality https://github.com/modelcontextprotocol/python-sdk/security
Insights https://github.com/modelcontextprotocol/python-sdk/pulse
Sign up for GitHub https://github.com/signup?return_to=%2Fmodelcontextprotocol%2Fpython-sdk%2Fissues%2Fnew%2Fchoose
terms of servicehttps://docs.github.com/terms
privacy statementhttps://docs.github.com/privacy
Sign inhttps://github.com/login?return_to=%2Fmodelcontextprotocol%2Fpython-sdk%2Fissues%2Fnew%2Fchoose
wenxuwanhttps://github.com/wenxuwan
modelcontextprotocol:mainhttps://github.com/modelcontextprotocol/python-sdk/tree/main
wenxuwan:try_fix_sse_disconnecthttps://github.com/wenxuwan/python-sdk/tree/try_fix_sse_disconnect
Conversation 13 https://github.com/modelcontextprotocol/python-sdk/pull/1222
Commits 13 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits
Checks 18 https://github.com/modelcontextprotocol/python-sdk/pull/1222/checks
Files changed https://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
fix: Handle SSE Disconnects Properly When use starlette middleware https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#top
Show all changes 13 commits https://github.com/modelcontextprotocol/python-sdk/pull/1222/files
e977423 fid sse client disconnect Jul 31, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/e97742305def10dc919f54f282ff2b60d52349fc
9019b4b fix pyright check error Jul 31, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/9019b4bc606e844e0babad613bda06ed0c92e33f
98129c2 recover unused change Jul 31, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/98129c25906142178908be6ae6813fa5161d65d1
f29a898 fix ruff check Jul 31, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/f29a898a8ee7e8e4c3d9ddf8e36b663fd14da26f
7149139 Merge branch 'main' into try_fix_sse_disconnect wenxuwan Aug 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/71491391ac8175aa325958ee4fbc3d20771c5f79
99e7a22 Merge branch 'main' into try_fix_sse_disconnect wenxuwan Aug 6, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/99e7a22985164be31b2d03c3c1ef7aec1ff4bebf
d1c5c55 Merge branch 'main' into try_fix_sse_disconnect wenxuwan Aug 11, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/d1c5c5562364aa6df5082c26a67739e6d8c7a938
a76076b Merge remote-tracking branch 'upstream/main' into try_fix_sse_disconnect Aug 19, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/a76076b469ba8108f878df322cc058f6dcecf9af
635ffcb return response for handle_sse Aug 20, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/635ffcbeb4c838c683279d061506e7f3911cced7
14e5b9b remove SilentResponse Aug 20, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/14e5b9b736e1e485d0fb0394a1d0114c2fabdc2f
a701467 fix typo Aug 20, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/a7014674f166474e533f48803f76df857391792a
18d248b fix ruff check error Aug 20, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/18d248b66dc1b6261e78372b0f9a69848866d33c
00e38a8 Merge branch 'main' into try_fix_sse_disconnect wenxuwan Aug 23, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1222/commits/00e38a8e1d62963e306cdfecb8c99d9dd79481b7
Clear filters https://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
src/mcp/server/fastmcp/server.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
View file https://github.com/modelcontextprotocol/python-sdk/blob/00e38a8e1d62963e306cdfecb8c99d9dd79481b7/src/mcp/server/fastmcp/server.py
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/modelcontextprotocol/python-sdk/pull/1222/{{ revealButtonHref }}
https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
https://github.com/modelcontextprotocol/python-sdk/pull/1222/files#diff-14a2991a8f2be5b9e60dab5fae92d2230dc23e57937ad5e5641b832d9c662738
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1222/files
https://github.com
Termshttps://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacyhttps://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Securityhttps://github.com/security
Statushttps://www.githubstatus.com/
Communityhttps://github.community/
Docshttps://docs.github.com/
Contacthttps://support.github.com?tags=dotcom-footer

Viewport: width=device-width

URLs of crawlers that visited me.