alpaca-trade-api-csharp: Request URI 414 "Too Large" for API request that still works with curl

I can make the following curl call:

 curl -i -X GET -H "APCA-API-KEY-ID: XXX" -H "APCA-API-SECRET-KEY: XXX" "https://data.alpaca.markets/v2/stocks/snapshots?symbols=NHI%2CNEV%2CNAPA%2CMYI%2CMXF%2CMVT%2CMO%2CMTG%2CMDH.U%2CLW%2CMBAC%2CMAXR%2CLZB%2CLFT%2CLEN.B%2CLEG%2CLDI%2CJMP%2CJLS%2CJCO%2CIDA%2CEQH%2CESM%2CEQHA.U%2CEQHA%2CEPRT%2CEPAC%2CEOS%2CEOG%2CEAI%2CDYFN%2CDY%2CECCY%2CECC%2CEAF%2CE%2CDTY%2CL%2CLC%2CKEX%2CKF%2CKEP%2CKEN%2CIGD%2CHIX%2CHIO%2CHGV%2CHLI%2CHLF%2CHHC%2CHII%2CHGLB%2CGTN.A%2CGNPK.U%2CHIG%2CHIE%2CPRPB.U%2CPRMW%2CPNC%2CPMX%2CPRGO%2CPPG%2CPOR%2CPNTM.U%2CPML%2CPMF%2CPLD%2CPIAI.U%2CPHG%2CKNOP%2CKMPR%2CKMI%2CKWAC%2CKRO%2CKN%2CKKR%2CLAD%2CKTN%2CKSU%2CKRP%2CKRC%2CKR%2CKMB%2CKIO%2CKEY%2CKBR%2CKMF%2CKAR%2CKKRS%2CKCAC%2CJPT%2CK%2CJWSM.U%2CJT%2CFTEV.U%2CFTHY%2CFST%2CGAPA%2CFSNB%2CFRXB.U%2CFRT%2CFSR%2CFDP%2CFDEU%2CFCX%2CFCPT%2CFPF%2CFEO%2CFBK%2CEXP%2CCPLG%2CCOUR%2CWBT%2CCPT%2CCPRI%2CCPK%2CCPF%2CCPA%2CCOTY%2CCOP%2CCPB%2CCP%2CCOMP%2CCOF%2CCO%2CCNR%2CCPS%2CCPG%2CCPAC%2CCORR%2CCOR%2CCOO%2CCOG%2CCNVY%2CCNO%2CCND.U%2CCODI%2CBABA%2CHD%2CFSM%2CCMG%2CBBVA%2CBBD%2CBAMI%2CBALY%2CBAH%2CAZRE%2CAXTA%2CAXP%2CBF.A%2CBDC%2CBCSF%2CBCE%2CBARK%2CQSR%2CPZN%2CPAGS%2CPZC%2CPYN%2CPVL%2CPMVC.U%2CPM%2CPINE%2CPH%2CPFO%2COGN%2COIS%2COHI%2CNVRO%2CNRG%2CNPV%2CNP%2CNETI%2CWLL%2CWLK%2CWIT%2CWIA%2CWHR%2CWHG%2CWHD%2CWGO%2CWFG%2CWF%2CWES%2CWELL%2CWEI%2CWEC%2CWDH%2CWD%2CWCN%2CWCC%2CWBK%2CWAT%2CWARR%2CWALA%2CWAL%2CTNET%2CTMHC%2CTME%2CTMAC%2CTM%2CTLYS%2CTLGA.U%2CTJX%2CTISI%2CTINV%2CTIMB%2CTHS%2CTHR%2CTHQ%2CTHG%2CTHC%2CTGT%2CTGS%2CTGP%2CTGI%2CTGH%2CTG%2CTFX%2CTFSA%2CSLQT%2CSLG%2CSLF%2CSLCA%2CSLAC.U%2CSLAC%2CSKY%2CSKX%2CSKT%2CSKLZ%2CSKIL%2CSJW%2CSJT%2CSJR%2CSJM%2CSJIJ%2CSIX%2CQVCC%2CQUOT%2CQTS%2CQGEN%2CQFTA.U%2CQD%2CPYT%2CPYS%2COG%2COFC%2CODC%2COCFT%2COCA%2CO%2CNXU%2CNXRT%2CNXR%2CNXP%2CNXN%2CNXC%2CNWHM%2CNWG%2CNVTA%2CNVST%2CNVS%2CNVR%2CNVO%2CNVG%2CNUW%2CNUVB%2CNUV%2CMOTV%2CMOGU%2CMOG.A%2CMODN%2CMNSO%2CMNRL%2CMMU%2CMMT%2CMMS%2CMMI%2CMMD%2CLUV%2CLUMN%2CLUB%2CLU%2CLTHM%2CLTC%2CLSI%2CLRN%2CJOE%2CJNPR%2CJLL%2CJKS%2CJHX%2CJHS%2CJHB%2CJFR%2CJEQ%2CINVH%2CINSW%2CINSP%2CINSI%2CGM%2CGLP%2CGLOP%2CFZT.U%2CFXLV%2CFIGS%2CFIF%2CFEI%2CFEDU%2CETO%2CETN%2CDVD%2CBTU%2CEBF%2CDXC%2CDNMR%2CDHI%2CDCP%2CCNS%2CCELP%2CCBRE%2CBOAS%2CBILL%2CBEDU%2CARGD%2CAON%2CISOS%2CAFGE%2CMOG.B%2CRFM%2CPBI%2CNOW%2CM%2CHRC%2CBIG%2CAVA%2CAMPY%2CAGTI%2CFOA%2CCRK%2CALL%2CAYX%2CAMP%2CATUS%2CATMR.U%2CATI%2CATHM%2CATC%2CATA%2CASZ.U%2CASGI%2CARNC%2CATHN.U%2CASAQ%2CASAI%2CARGO%2CARE%2CARC%2CAOD%2CANF%2CANET%2CAPSG%2CAPD%2CAMPI.U%2CAJX%2CAJG%2CAIZN%2CAOMR%2CRCS%2CNAT%2CMOS%2COTIS%2CLYV%2CPIPP%2CMUSA%2CCNK%2CCEQP%2CEFC%2CDOOR%2CAIZ%2CCORS.U%2CWARR.U%2CITW%2CUSX%2CUSM%2CBIO%2CUNM%2CBLL%2CUNP%2CUNF%2CUWMC%2CUTL%2CUSDP%2CURI%2CUPH%2CUNFI%2CUFS%2CUBA%2CTY%2CNVGS%2CNTG%2CNMS%2CNMM%2CNMI%2CNMCO%2CNLY%2CNL%2CNIQ%2CNIE%2CNLSN%2CNKX%2CNKE%2CNGC%2CNFJ%2CNEWR%2CNI%2CNGVT%2CNGL%2CNGC.U%2CNEX%2CNEU%2CNEP%2CNC%2CNBR%2CJBGS%2CJEF%2CIPVA%2CIPOD%2CITCB%2CISOS.U%2CINT%2CIIM%2CIHC%2CIGR%2CIGI%2CIGT%2CIGA%2CDEA%2CDDS%2CDCF%2CDBL%2CDBD%2CDAVA%2CFMC%2CDASH%2CDAO%2CDAC%2CCYH%2CDB%2CDAL%2CCXP%2CDIS%2CDAR%2CDAN%2CD%2CCYD%2CCXW%2CCXH%2CCWT%2CCXE%2CBTCM%2CBSTZ%2CBSM%2CBSIG%2CBSL%2CBTA%2CBSAC%2CBXS%2CBXMT%2CBWSN%2CBUR%2CMAS%2CBRO%2CBRK.A%2CBQ%2CABM%2CCCK%2CAAQC.U%2CZUO%2CPSPC%2CBSAQ.U%2CAMR%2CXPOA%2CXIN%2CXFLT%2CWY%2CWTTR%2CWTRG%2CWH%2CWBS%2CVVR%2CTNC%2CVTN%2CZIP%2CZIM%2CZH%2CZEV%2CZEPP%2CZEN%2CZBH%2CYUMC%2CYUM%2CYSG%2CYRD%2CYPF%2CYOU%2CYMM%2CYEXT%2CYETI%2CYELP%2CYALA%2CYAC%2CUSPH%2CUSNA%2CUSFD%2CUSB%2CUSAC%2CUSA%2CUP%2CUNMA%2CUMC%2CUI%2CUHT%2CUHS%2CUGIC%2CUGI%2CSRLP%2CSRL%2CSRI%2CSRG%2CSREA%2CSRE%2CSRC%2CSQZ%2CSQNS%2CSQM%2CSQ%2CSPXX%2CSPR%2CRWT%2CRVT%2CRVLV%2CRTX%2CRTPZ.U%2CRTPZ%2CRTP.U%2CRTP%2CRSI%2CRSG%2CRRD%2CRPT%2CRPM%2CRPAI%2CROT.U%2CROSS%2CROP%2CRONI.U%2CROL%2CROK%2CPLAN%2CPKI%2CPKG%2CPKE%2CPK%2CPJT%2CPIPR%2CPIPP.U%2CPINS%2CPING%2CPIM%2CPII%2CPICC.U%2CPICC%2CPIAI%2CPHX%2CPHT%2CPHR%2CPHM%2CPHK%2CPHI%2CPHD%2CPGZ%2CPGTI%2CPGRE%2CPGR%2CPGP%2CJDD%2CJCI%2CJCE%2CJBL%2CJBK%2CJAX%2CJATT.U%2CJ%2CIX%2CIVR%2CIVH%2CIVC%2CIVAN.U%2CIVAN%2CHUM%2CHUGS.U%2CHUGS%2CHUBS%2CHUBB%2CHTPA%2CHTH%2CHTGC%2CHTD%2CHT%2CHSY%2CHEI%2CGRC%2CGPX%2CGPOR%2CGPN%2CGPMT%2CGPJA%2CGOOS%2CGOLD%2CGOL%2CGOF%2CGOAC%2CGNE%2CGMS%2CGMRE%2CFREY%2CFRC%2CFRA%2CFR%2CFPI%2CFPH%2CFPAC.U%2CFPAC%2CFOUR%2CFCT%2CFCRX%2CFCRW%2CFCF%2CEQD.U%2CEQD%2CEQC%2CEPWR.U%2CEPWR%2CEPR%2CENBL%2CENBA%2CEMR%2CEMPW.U%2CEMP%2CEMO%2CEFR%2CCFG%2CCEE%2CCE%2CBFS%2CBFAM%2CBDX%2CBAC%2CAQN%2CTPB%2CTNP%2CTMX%2CTMAC.U%2CTKC%2CTIXT%2CTEO%2CSUZ%2CSUM%2CSTZ%2CSTT%2CSTNG%2CSTAG%2CCLAA%2CSRT%2CIACC%2CSOLN%2CFRXB%2CSON%2CSOJC%2CSNP%2CSBII%2CSM%2CSHW%2CSJI%2CSITE%2CSID%2CSHLX%2CSTPC%2CSMM%2CMHO%2CCAJ%2CBSX%2CPG%2CHCI%2CGFF%2CABT%2CAAIC%2CAAT%2CBJ%2CVAL%2CUPS%2CZETA%2CBE%2CAVTR%2CAAN%2CACIC.U%2CHMLP%2CHMC%2CGE%2CARCO%2CAPGB%2CAMH%2CALIT%2CADT%2CAMRC%2COMC%2CNTR%2CNEXA%2CMTX%2CMRK%2CMTN%2CMPA%2CMEG%2CMACC.U%2CMOV%2CMCO%2CMATX%2CMHD%2CMFM%2CPFH%2CPDOT%2CPFGC%2CPFD%2CPEN%2CPDAC%2CPCPC%2CPEB%2CPDS%2CPDO%2CPCQ%2CPCG%2CPBA%2CPATH%2CPAR%2CPACK%2CPACE.U%2CLII%2CLEAP%2CLDP%2CLBRT%2CLDL%2CLCI%2CKSS%2CKREF%2CKSM%2CKRA%2CKOP%2CKOS%2CGHLD%2CKTF%2CKOF%2CKNX%2CGES%2CKMT%2CKODK%2CDFNS.U%2CDFIN%2CDFNS%2CDEN%2CDEI%2CDDD%2CDE%2CDEH%2CDECK%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(The reason for the massive number of symbols is because I want a snapshot of an entire exchange.)

Making this call, I get a 200 OK back on the terminal, plus my JSON data.

However, making this call with AlpacaDataClient.GetSnapshotsAsync(stocksOnExchange).ConfigureAwait(false);, where stocksOnExchange is a ConcurrentBag<string>, I get an HTTP 414 error code back, with this stack trace:

Unhandled exception. Alpaca.Markets.RestClientErrorException: Request-URI Too Large
 ---> Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0.
   at Newtonsoft.Json.JsonTextReader.ParseValue()
   at Newtonsoft.Json.JsonReader.ReadForType(JsonContract contract, Boolean hasConverter)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
   at Alpaca.Markets.HttpResponseMethodExtensions.getException(HttpResponseMessage response, JsonReader reader)
   --- End of inner exception stack trace ---
   at Alpaca.Markets.HttpResponseMethodExtensions.DeserializeAsync[TApi,TJson](HttpResponseMessage response)
   at Alpaca.Markets.HttpClientExtensions.callAndDeserializeAsync[TApi,TJson](HttpClient httpClient, HttpRequestMessage request, CancellationToken cancellationToken)
   at Alpaca.Markets.HttpClientExtensions.callAndDeserializeAsync[TApi,TJson](HttpClient httpClient, HttpMethod method, Uri endpointUri, CancellationToken cancellationToken)
   at Alpaca.Markets.HttpClientExtensions.GetAsync[TKeyApi,TValueApi,TKeyJson,TValueJson](HttpClient httpClient, UriBuilder uriBuilder, IEqualityComparer`1 comparer, Func`2 elementSelector, CancellationToken cancellationToken)
   at Alpaca.Markets.AlpacaDataClient.GetSnapshotsAsync(IEnumerable`1 symbols, CancellationToken cancellationToken)

It’s not clear to me why the server would respond with a 414, or whether this is an upstream dependency issue. I use Alpaca.Markets 5.0.4 and Alpaca.Markets.Extensions 5.0.3.